A noun appearing as G. gwanos “family, birth, heredity” in the Gnomish Lexicon of the 1910s, a combination of G. gwa- “together” and G. nôs “birth” (GL/44), hence probably originally something like “*totality of births”.

Neo-Sindarin: I think ᴺS. gwanos can be retained in Neo-Sindarin as a combination of S. go- “together” and S. nos(s) “kindred”, especially in reference to one’s lineage.