A masculine given name of Scottish and Irish origin, derived from the Gaelic name Cailean meaning 'young warrior' or 'whelp'.
From Scottish Gaelic Cailean, possibly from cailean meaning 'whelp' or 'young dog', or from Old Irish Caílín. The name spread from Scotland and Ireland to other English-speaking countries, often anglicized as Colin and sometimes confused with the unrelated French name Colin (diminutive of Nicholas).
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