Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sŭĕo, ēre [assumed as a stem for the form sŭēmus, which is probably a contracted perf., = suevimus from suesco; cf. consuesco and the Gr. εἰώθαμεν], to be wont, used, or accustomed: appellare suemus, Lucr. 1, 60: cernere suemus (dissyl.), id. 1, 301: perhibere suemus, id. 4, 369.
Suēvi or Suēbi (in inscrr. always; but most MSS. have Suevi), ōrum, m., the Suevi, a powerful people in the north-eastern part of Germany, Caes. B. G. 4, 1; Tac. G. 38; Luc. 2, 51.
Hence,