Gyflette, Gylet, Gyrflet, Gyrflette, Jeffelot, Jurflete
Squire of Guinglain (Gawain’s son) in Thomas Chestre’s Lybeaus Desconus.
Possible sources include Chestre’s own Gyfre, from Launfal, and the knight Girflet.
Source
Lybeaus Desconus | Thomas Chestre, late 14th century