- MicahA book of the Old Testament of Bible, and of the Tanakh.
- micaAny of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.
- MikaA female given name from Japanese.
- MicaiahA prophet in the court of King Ahab and possibly a disciple of Elijah in the Old Testament of the Bible in 1 Kings 22.