Proto-Celtic *kʷaryos

→ Catalan pèr (derived)

→ Catalan perol (derived)

→ Irish pair (derived(ga/cy))

→ Irish coire (inherited)

→ Scottish Gaelic coire (derived)

→ Cornish per (inherited(kw/br))

→ Latin Parisii (derived)

→ Middle Irish coire (inherited)

→ Middle Irish coire (inherited(mga/sga))