Welsh haul

← Breton heol (cognate)

← Proto-Celtic *sāwol (inherited)

← Proto-Indo-European *sóh₂wl̥ (inherited)

← Cornish howl (cognate)

← Old Irish súil (cognate)

← Middle Welsh heul (inherited)

→ Welsh huan (cognate)

→ Welsh heulwen (compound)

→ Welsh heuldro (compound)

→ Welsh heulsaf (compound)

→ Welsh heulog (affix)

→ German Sonne (cognate)

→ Irish súil (cognate)

→ Scottish Gaelic sùil (cognate)

→ Manx sooill (cognate)

→ Icelandic sunna (cognate)

→ Cornish howl (cognate)

→ Old Irish súil (cognate)