Words that come from Proto-Celtic ɸales-

19 words across 5 languages descend from Proto-Celtic ɸales- — including ail, ail, oil, ailén, ellan, oileán, oileánra, ellanragh.

See the etymology of ɸales- itself →

Irish (8)

Manx (4)

Scottish Gaelic (4)

Old Irish (2)

Yola (1)