Hi Lisa,
the name Ubach comes from Germany. Umbach has been a very small town and was desturbed in the middle age. In that time everybody had to choose a last name and the surviving citicens of Umbach used this name as theres. Umbach has been located between Kassel and Lohfelden. That is in the north of Hessen. Today we still have a little town named Crumbach which is a part of Lohfelden today. Hope I could help you
Katja
KatjaMusik@aol.com