Duffy

Duffy is an Irish surname anglicized from Ó Dubhthaigh, meaning 'descendant of Dubhthach,' a byname derived from Old Irish dubh (black, dark). As a pet name the Irish surname has a soft, bouncy quality that feels friendly rather than weighty.

Duffy is the kind of name that trips off the tongue with instant warmth. The Irish surname origin gives it cultural roots, but the sound — that light double syllable with the bouncy F — is what makes it work so well for pets. It suits dogs with a scruffy, friendly charm more than any specific breed: the kind of dog who always looks like he just came back from a great adventure and is already planning the next one. The -y ending keeps it in firmly affectionate territory without tipping into baby-talk.