Ysolde is a female name.
Ysolde is a variant of the name Isolde, which is a name of Celtic or Old High German origin. The Germanic form derived from the names Ishild or Iswalta and the Celtic form derived from the Old Irish name Essylt.
Ysolde means “iron ruler” (from Old High German “isan” = iron + “hiltja” = battle + “waltan” = to rule). In Celtic, Isolde means “one who is gazed at” or “the beautiful one” (from kymric “syllu” = to gazed at).