G. fwi- pref. “fem. patronymic prefix” (Category: Daughter)
A “fem. patronymic prefix” in the Gnomish Lexicon of the 1910s, with a suffixal form -thwi (GL/36), probably meaning “*daughter of” given its comparison to G. suil “daughter” (GL/68) and probably derived from the early root ᴱ√SUẈU (QL/87).
References ✧ GL/36, 68