Old Irish leth

← Proto-Celtic *letos (inherited)

← Proto-Celtic *ɸletos (inherited)

← Welsh lled (cognate)

← Cornish les (cognate)

← Latin latus (mention)

← Primitive Irish *ᚂᚓᚈᚐᚄ (inherited)

← Middle Breton let (cognate)

← Middle Breton led (mention)

→ Irish leaba (mention)

→ Irish leath (inherited)

→ Scottish Gaelic leth (inherited)

→ Old Irish la (mention)

→ Old Irish lepaid (compound)

→ Old Irish lettáeb (compound)