Welsh gwern

← Proto-Brythonic *gwern (inherited)

← Proto-Celtic *wernā (inherited)

← Old Irish fern (cognate)

← Albanian verr (cognate)

← Old Armenian գերան (cognate)

→ Welsh gwernog (affix)

→ Irish fearnóg (cognate)

→ Scottish Gaelic feàrna (cognate)

→ Manx farney (cognate)

→ Old Irish fern (cognate)

→ Albanian verr (cognate)