Cornish bledhen

← Breton blizenn (cognate)

← Breton bloaz (cognate)

← Proto-Celtic *blēdanī (inherited)

← Welsh blwydd (cognate)

← Welsh blynedd (cognate)

← Proto-West Germanic *blait (cognate)

← Proto-Indo-European *bʰloyd- (derived)

← Cornish bloth (cognate)

← Lithuanian blaĩvas (cognate)

← Old Breton blened (cognate)

← Old Cornish bliþen (inherited)

← Old Irish blíadain (cognate)

← Albanian blehurë (cognate)

→ Welsh blwydd (cognate)