Menealf
A knight who, in the Middle English Avowing of King Arthour, kidnapped a maiden. Kay challenged him and was defeated; Gawain succeeded in rescuing the maiden and avenging Kay.
His character may have been inspired by Meleagant (Meliagrant), though his name is likely a fusion of ‘man’ and ‘elf’.
Source
The Avowing of King Arthur, Sir Gawain, Sir Kay, and Baldwin of Britain | Late 13th century or early 14th century