Had you looked in Child, you would have found that his title for it is "Sir Hugh, or The Jew's Daughter". Not so much a matter of knowledge, but of knowing where to look. Any Child ballad one is going to sing may be checked at source. A full list of the Child ballads is online in Wikipedia at

https://en.wikipedia.org/wiki/List_of_the_Child_Ballads

≈M≈