
1) Germanic given name 
Found on 
https://www.crosswordclues.com/clue/welf
 [father of Judith]
[father of Judith]  Welf (or Hwelf) I of Altdorf (died 825) was master of several counties in the southern Rhineland & Bavaria. His family became politically powerful when Louis the Pious chose his oldest daughter as his 2nd wife. Though Welf himself never became publicly prominent, his family became interwoven with the Carolingian dynasty. ...
Found on 
http://en.wikipedia.org/wiki/Welf_(father_of_Judith)
  No exact match found.