What is the ethnic origin of surname Guckian?

The surname Guckian is of Irish origin. It is a variant of the surname Gaughan, which itself is derived from the Gaelic Ó Gadhgáin.

Ó Gadhgáin is a sept name meaning "descendant of Gadhgán". Gadhgán is a personal name of unknown meaning.

Guckian is likely a result of anglicization, with the "G" being softened to a "K" sound. It is most commonly found in counties Mayo and Galway in Ireland.