Welsh taran

← Breton taran (cognate)

← Proto-Celtic *toranos (derived)

← Irish toirneach (cognate)

← Scottish Gaelic tàirneanach (cognate)

← Manx taarnagh (cognate)

← Cornish taran (cognate)

← Middle Welsh taran (inherited)

→ English thunder (cognate)

→ Welsh taranu (affix)