Callan

From a surname, the Anglicized form of the Irish Ó Cathaláin, which means “descendant of Cathalán”.
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Callahan

From a surname, the Anglicized form of the Irish Ó Ceallacháin, which means “descendant of Ceallachán”.
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Calla

From the name of a type of lily, of Latin origin. Use of the name may also be inspired by Greek κάλλος (kallos) meaning “beauty”.
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Calixtus

Variant of Callistus, the spelling perhaps influenced by Latin calix “wine cup”. This was the name of three popes (also known as Callistus).
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