氏ぬ is read as しぬ (shinu) and means to die.
しぬ
shinu
うじな
(full) name
うじがみ
patron god
し
clan
しぞく
うじこ
shrine parishioner
うじびと
lineal descendant
うじ
しのいけん
his opinion
うじこそうだい
parishioner representative
うじぶみ
ancient clan record (incl. their origins, their achievements, etc.)
しめいけん
right to use one's name
しぞくせいど
family or clan system