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In the entire world, Йоас (Joas , Йоас) is quite a common principally masculine, but very seldom female forename. The given name Йоас is characteristic of Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is quite a rare predominantly boy's, but very infrequently girly name, Namibia, where it is quite a rare masculine name, and Tanzania. Measured by absolute frequency, it is the most numerous in the Democratic Republic of the Congo, Brazil, and Tanzania. Also, Йоас is the last name as well as the forename.
Йоас is also a name for the fictitious and mythical characters: Joas , character in Athalie and Joas , character in Athalie.