CASTELO FAMILY - An unusual surname

I have found this family with a surname never seen in Ribeira Seca before. None of the ancestors carried that surname, which leads me to believe that initially was a nickname.
Seems that many of them immigrated to California and some used the variaton Castello. Any Castelo/Castello out there?

Descendants of Vitorino José de Mendonça

Generation No. 1

1. Vitorino José3 de Mendonça (Jorge Machado2 Mendonça, António Machado1) was born 22 Jul 1838 in Ribeira Seca, ilha de S. Jorge, and died 5 Nov 1907 in Portal, Ribeira Seca, ilha de S. Jorge. He married Isabel Mariana da Silveira 23 Aug 1866 in Ribeira Seca, ilha de São Jorge, daughter of José Flores and Bárbara Mariana. She was born 17 Dec 1845 in Portal, Ribeira Seca, ilha de S. Jorge, and died 15 Sep 1894 in Portal, Ribeira Seca, ilha de S. Jorge.

Children of Vitorino de Mendonça and Isabel da Silveira are:
+ 2 i. Maria Isabel4 da Silveira, born 24 Jan 1867 in Portal, Ribeira Seca, ilha de S. Jorge.
3 ii. José Vitorino Castelo, born 23 Dec 1868 in Portal, Ribeira Seca, ilha de S. Jorge.
+ 4 iii. António Castelo, born 23 Mar 1871 in Portal, Ribeira Seca, ilha de S. Jorge; died 6 Mar 1951 in Tulare Co., CA, USA.
+ 5 iv. Jorge Vitorino Castelo, born 24 Sep 1873 in Portal, Ribeira Seca, ilha de S. Jorge; died 3 May 1961 in Capitola, Santa Cruz Co., CA, USA.
+ 6 v. João Vitorino Castelo, born 28 Nov 1875 in Portal, Ribeira Seca, ilha de S. Jorge.
7 vi. Alexandre, born 9 Mar 1878 in Portal, Ribeira Seca, ilha de S. Jorge.
+ 8 vii. Vitorino Alexandre Castelo, born 9 Mar 1878 in Portal, Ribeira Seca, ilha de S. Jorge.
+ 9 viii. Mariana Guiomar Vitorina, born 9 Mar 1880 in Portal, Ribeira Seca, ilha de S. Jorge.
+ 10 ix. Rita Angelina, born 15 Mar 1882 in Portal, Ribeira Seca, ilha de S. Jorge.
+ 11 x. Manuel Vitorino Castelo, born 25 Apr 1884 in Portal, Ribeira Seca, ilha de S. Jorge.


Generation No. 2

2. Maria Isabel4 da Silveira (Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 24 Jan 1867 in Portal, Ribeira Seca, ilha de S. Jorge. She married (2) João Silveira Brasil 4 Feb 1925 in Ribeira Seca, ilha de S. Jorge, son of António Brasil and Mariana de Ávila. He was born 24 Aug 1860 in Portal, Ribeira Seca, ilha de S. Jorge, and died 10 Feb 1932 in Ribeira Seca, ilha de S. Jorge.

Child of Maria Isabel da Silveira is:
12 i. Maria5 da Silveira, born 4 Dec 1887 in Portal, Ribeira Seca, ilha de S. Jorge. She married João Vitorino da Silveira 27 Nov 1915 in Ribeira Seca, ilha de São Jorge.


4. António4 Castelo (Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 23 Mar 1871 in Portal, Ribeira Seca, ilha de S. Jorge, and died 6 Mar 1951 in Tulare Co., CA, USA. He married (1) ? Abt. 1888. He married (2) Mary M. Azevedo Abt. 1906. She was born Abt. 1890 in CA, USA.

Children of António Castelo and ? are:
13 i. Louise E.5 Castello, born Abt. 1891.
14 ii. Joseph E. Castello, born 2 Mar 1892 in CA, USA; died 24 Nov 1970 in Clovis, Fresno Co., CA, USA.
15 iii. Minnie V. Castello, born Abt. 1894.
16 iv. Helen A. Castello, born Abt. 1897.
17 v. Emmanuel Castello, born Abt. 1900.


Children of António Castelo and Mary Azevedo are:
+ 18 i. Viola5 Castello, born 3 May 1907 in Marin Co., CA, USA; died 27 Jul 1997 in Visalia, Tulare Co., CA, USA.
19 ii. Alice M. Castello, born Abt. 1910.
20 iii. Ailleen R. Castello, born Abt. 1912.


5. Jorge Vitorino4 Castelo (Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 24 Sep 1873 in Portal, Ribeira Seca, ilha de S. Jorge, and died 3 May 1961 in Capitola, Santa Cruz Co., CA, USA. He married (1) ?. He married (2) Maria S. 9 Feb 1928 in CA, USA. She was born Abt. 1878.

Child of Jorge Castelo and ? is:
21 i. Anthony H.5 Castelo, born Abt. 1915.


6. João Vitorino4 Castelo (Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 28 Nov 1875 in Portal, Ribeira Seca, ilha de S. Jorge. He married Mary Fielda in San Jose, Santa Clara Co., CA, USA, daughter of Frank Fielda and Mary. She was born Abt. 1880.

Children of João Castelo and Mary Fielda are:
22 i. Angie5 Castelo, born Abt. 1904. She married Antone Souza 25 Dec 1920; born in Santa Clara Co., CA, USA.
23 ii. LaVerne Castelo.


8. Vitorino Alexandre4 Castelo (Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 9 Mar 1878 in Portal, Ribeira Seca, ilha de S. Jorge. He married Maria Augusta da Silveira 30 Nov 1901 in Ribeira Seca, ilha de S. Jorge, daughter of José de Azevedo and Mariana da Silveira. She was born 18 Feb 1877 in Ribeira Seca, ilha de S. Jorge.

Children of Vitorino Castelo and Maria da Silveira are:
24 i. José Vitorino5 Castelo, born 5 Mar 1902 in Portal, Ribeira Seca, ilha de S. Jorge.
25 ii. Isabel Alexandrina Castelo, born 1 Feb 1904 in Portal, Ribeira Seca, ilha de S. Jorge.
26 iii. António Vitorino Castelo, born 10 Dec 1905 in Portal, Ribeira Seca, ilha de S. Jorge; died 13 Jun 1952 in Alameda Co., CA, USA. He married Lillie Silva; born Abt. 1909 in CA, USA.
+ 27 iv. Francisco de Paula Castelo, born 25 Mar 1908 in Portal, Ribeira Seca, ilha de S. Jorge; died 31 Aug 1989 in Tulare, Tulare Co., CA, USA.


9. Mariana Guiomar4 Vitorina (Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 9 Mar 1880 in Portal, Ribeira Seca, ilha de S. Jorge. She married Manuel José Vitorino 14 Sep 1903 in Ribeira Seca, ilha de S. Jorge, son of Francisco Vitorino and Bárbara Anjos. He was born Abt. 1867 in Ribeira Seca, ilha de S. Jorge.

Child of Mariana Vitorina and Manuel Vitorino is:
28 i. George5 Victorino. He married Dorothy Almo.


10. Rita4 Angelina (Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 15 Mar 1882 in Portal, Ribeira Seca, ilha de S. Jorge. She married José Carreiro 26 Jul 1909 in Ribeira Seca, ilha de S. Jorge, son of António de Ávila and Joana Emília. He was born 14 Nov 1880 in Pojal, Ribeira Seca, ilha de S. Jorge.

Child of Rita Angelina and José Carreiro is:
29 i. Maria Angelina5 Carreiro, born 26 Jul 1910 in Ribeira Seca, ilha de S. Jorge. She married João dos Álamos Silveira 4 Feb 1932 in Ribeira Seca, ilha de S. Jorge; born 4 Feb 1905 in Portal, Ribeira Seca, ilha de S. Jorge.


11. Manuel Vitorino4 Castelo (Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 25 Apr 1884 in Portal, Ribeira Seca, ilha de S. Jorge. He married Maria Reis 29 Nov 1915 in S. José, Oakland, Alameda Co., CA, USA. She was born Abt. 1892 in Açores.

Children of Manuel Castelo and Maria Reis are:
30 i. Melvina5 Castello.
31 ii. Elmo Vitorino Castello.


Generation No. 3

18. Viola5 Castello (António4 Castelo, Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 3 May 1907 in Marin Co., CA, USA, and died 27 Jul 1997 in Visalia, Tulare Co., CA, USA. She married (1) Manuel E. Silva Abt. 1923. He was born Abt. 1890 in Açores. She married (2) ? Sardo.

Children of Viola Castello and Manuel Silva are:
32 i. Manuel E.6 Silva.
33 ii. Margaret Enos Silva.


27. Francisco de Paula5 Castelo (Vitorino Alexandre4, Vitorino José3 de Mendonça, Jorge Machado2 Mendonça, António Machado1) was born 25 Mar 1908 in Portal, Ribeira Seca, ilha de S. Jorge, and died 31 Aug 1989 in Tulare, Tulare Co., CA, USA. He married Mariana Gomes 11 Jun 1932 in Ribeira Seca, ilha de S. Jorge, daughter of José Gomes and Teresa de Jesus. She was born 26 Jan 1906 in Portal, Ribeira Seca, ilha de S. Jorge, and died 17 Jun 1995 in Tulare Co., CA, USA.

Child of Francisco Castelo and Mariana Gomes is:
34 i. Jorge Alexandre6 Castelo, born 7 Sep 1933 in Ribeira Seca, ilha de S. Jorge; died 29 Jan 1997 in Visalia, Tulare Co., CA, USA.