Welsh teulu

← Proto-Celtic *tegoslougom (inherited)

← Proto-Celtic *tegos (inherited)

← Proto-Celtic *slougos (inherited)

← Welsh tŷ (affix)

← Welsh llu (affix)

← Irish teaghlach (cognate)

← Scottish Gaelic teaghlach (cognate)

← Manx lught thie (cognate)

← Proto-Indo-European *(s)teg- (root)

← Cornish teylu (cognate)

→ Welsh tylwyth (mention)

→ Cornish teylu (cognate)

→ Old Irish teglach (cognate)