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I agree with Chrisell that Callan's popularity in Queensland probably comes from its similarity in sound to Callum. But it may not be a complete creation, because Callan and Callen exist as Scottish and Irish surnames. According to Reaney & Wilson's A Dictionary of English Surnames, in Scotland Callan is a variation of MacAllan, and in Ireland it is derived from Cathalan, a diminutive of a name meaning "battle mighty."