An interesting common NC root. An original polysemy ("root, seed" : "kin, clan") can be reconstructed, because both meanings keep recurring in different subbranches (Nakh, Avar, WC, HU). The meaning 'leaf' in PC is obviously secondary - although phonetically PC *ƛib(u) goes back directly to *Hĭƛ̣_īwV, semantically it has merged with PNC *ƛ̣ăpi 'leaf' q.v.