Lewis & Short

Usīpĕtes, um, m., a Germanic people on the Rhine, near the Tenchteri, Caes. B. G. 4, 1; 4, 4; 4, 16; Tac. A. 1, 51.
Called also Usīpĭi, Tac. A. 13, 56; id. H. 4, 32; id. G. 32; id. Agr. 28; 32.