氏ぬ is read as しぬ (shinu) and means to die.
しぬ
shinu
しめい
(full) name
うじがみ
patron god
し
clan
しぞく
うじこ
shrine parishioner
うじびと
lineal descendant
うじのかみ
head of a clan
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