Across the world, Isiah (Isiah 
) is quite a common principally male, but very seldom female first name. The first name Isiah is characteristic of the United States, where it is quite a rare masculine name, Nigeria, where it is quite a rare epicene name, and Trinidad and Tobago, where it is quite a rare boy's name. In absolute terms, it is commonest in the United States, Nigeria, and South Africa. Very seldom, Isiah is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Isiah | Zimbabwe, South Africa, Malaysia, United States, Nigeria |
| isiah joseph (born 1887) (b. 1887) |
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isiah leggett American politician, US (b. 1944) |
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isiah m. warner chemist, US (b. 1946) |
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isiah thomas American basketball player, coach, executive, US (b. 1961) |
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isiah young American sprint athlete, US (b. 1990) |
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isiah koech Kenyan athlete, KE (b. 1993) |
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isiah cage chicago-born offensive lineman, US (b. 1993) |
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isiah kiner-falefa baseball player (1995-), US (b. 1995) |
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| isiah robertson American football player (1949-2018), US (b. 1949) |
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| isiah whitlock American actor, US (b. 1954) |
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| isiah carey American journalist, US (b. 1970) |
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| isiah victor American basketball player, US (b. 1978) |
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| isiah williams American basketball player, US |
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| isiah davis college basketball player (1990–1990) Northwestern State |
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| isiah carson college basketball player (2005–2009) St. Bonaventure; Miami (OH) |
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