Family name Inácio (Inacio 
, Inácio 
) , in all the world, is a widespread last name. The cognomen Inácio is characteristic of Portugal, where it is a common surname, Curacao, where it is quite a common surname, and Angola (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Brazil, Angola, and Portugal. Likewise, Inácio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Inacio | Portugal, Angola, India, Brazil, Mozambique |
| Inácio | Portugal, Angola, France, Brazil, Mozambique |
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inácio de azevedo Portuguese missionary, PT (b. 1528) |
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| inácio da costa Portuguese Jesuit missionary, 1603?-1666, PT (b. 1603) |
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| inácio sanga Macao-born Jesuit missionary (b. 1631) |
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inácio de santa teresa PT (b. 1682) |
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| inácio barbosa machado Portuguese historian, PT (b. 1686) |
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| inácio de oliveira bernardes Portuguese painter, PT (b. 1695) |
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| inácio accioli de vasconcelos Portuguese military officer and landowner in Colonial Brazil (b. 1714) |
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| inácio monteiro Portuguese mathematician, PT (b. 1724) |
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inácio luís madeira de melo Portuguese military officer, PT (b. 1775) |
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| inácio correia pamplona PT (b. 1731) |
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| inácio da silva coelho valente Portuguese painter, PT (b. 1748) |
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inácio de sousa rolim Brazilian priest (1800-1899), BR (b. 1800) |
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joaquim josé inácio Brazilian military leader and politician (1808–1869), BR (b. 1801) |
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| inácio de sousa vernek BR (b. 1742) |
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| inácio ferreira (b. 1743) |
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