Throughout the world, Izaac (Izaac 
) is quite a rare boy's first name. The forename Izaac is habitual in Brazil, where it is quite a rare masculine name, Australia, where it is a rare male name, and Indonesia. Measured by absolute frequency, it is the most numerous in Brazil, Indonesia, and Mexico. Very seldom, Izaac is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Izaac | Indonesia, Mexico, Brazil, France, United States |
Iisakki, Isaac, Isaacus, Isaak, Isac, Isacco, Isak, Issaak, Issac, Itshak, Itzhak, Izaak, Izak, Izsak, Izsák, Jicchak, Yitshak, Yitzhak, Айзек, Изаак, Исаак, Исаак, Айзек, Исаако, Исак, Исако, Исхак, Ицхак, Ицхок, Ісаак, Ісак, Іцхак, אייזיק, יצחק, أوتو, إسحاق, إسحق, اسحاق, ايزاك, and イサク
| izaac de monij NL (b. 1704) |
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izaac scheltus NL (b. 1798) |
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| izaac van beest holle (1791-1848) (b. 1791) |
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izaac hindom Indonesian bureaucrat and politician (1934-2009), ID (b. 1934) |
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| izaac groenenberg NL (b. 1903) |
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| izaac van hennik NL (b. 1908) |
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izaac darío enciso castillo Visual artist, MX (b. 1980) |
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| izaac wang American actor, US |
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| izaac sit researcher |
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| izaac g. sanderswood particle physicist |
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| izaac johanes wanggai Indonesian footballer, ID (b. 1982) |
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| izaac williams New Zealand basketball player, NZ (b. 1989) |
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| izaac winderbaum |
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| izaac silva |
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| izaac jeremy baxter (born 1996) (b. 1996) |
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Melo, Junior, Vieira, Martins, Marques, Machado, Santana, Almeida, Andrade, Cardoso, Barbosa, Batista, Bezerra, Pereira, Ribeiro, Freitas, Carvalho, Lee Kenzo, Ferreira, Oliveira, Conceicao, Rodrigues, Borges, Castro, Araujo, Soares, Cruz, Reis, Dias, Lima, Neto, Matos, Silva, Sousa, Souza, Alves, Fernandes, Costa, Pinto, Ramos, Rocha, Gomes, Lopes, Jesus, Nunes, Filho, Mendes, Santos, Brito, and Nascimento