What is "culhwch"

Culhwch (, with the final consonant of Scottish "loch"), in Welsh mythology, is the son of Cilydd son of Celyddon and Goleuddydd, a cousin of Arthur and the protagonist of the story Culhwch and Olwen (the earliest of the medieval Welsh tales appended to Lady Charlotte Guest's edition of the Mabinogion). In this tale the etymology of Culhwch is explained as "sow run" (cul "narrow, a narrow thing"; hwch "sow, pig"), but this is likely to be folk etymology. According to the narrative, Culhwch is born to his maddened mother Goleuddydd after she is frightened by a herd of swine. The swineherd finds Culhwch in the pigs' run, and takes him back to his father Cilydd. Culhwch is described as being "of gentle lineage".