Chaemae
The Chaemae were an ancient Germanic tribe cited by Ptolemy in his Geography with the name Chaimai, which also can be written in English Khaimai.
Nomenclature
All three designations probably stem from common Germanic *haimaz, "home", from Proto-Indo-European *tkei-, "settle." Where the Cham-avi reflects the ham- form, the other two reflect the -heim form. The monophthongization was an Ingvaeonic innovation. We are more familiar with -ham because a large part of the lowlanders moved to Britain.The Chaemi may reflect a more ancient distribution of people calling themselves "settlers" or "natives." Why they would have done so remains obscure, but the name is of the same type as hed-, human and possibly but less certainly man.