Cullan is a masculine name with Irish and Gaelic origins. It derives from the Gaelic surname 'Ó Cuilinn,' meaning 'son of Holly' or from 'cuileann,' referring to the holly tree, which was considered sacred in Celtic tradition. This name carries connotations of strength and protection, as holly was believed to ward off evil spirits in Celtic folklore. Cullan might also be connected to the Irish mythological figure Culann, the smith who owned the hound that was killed by the young Cúchulainn (who was originally named Setanta). While not among the most common Irish names, Cullan has gained moderate popularity as parents seek authentic Celtic names with meaningful heritage. Its straightforward pronunciation and spelling, combined with its distinctive sound, make it appealing for those seeking a name with Celtic roots.