From the same form as Peleth; a courier (collectively) or official messenger -- Pelethites.
see HEBREW Peleth
H6432. Pelethi
מְּלֵתִי adjective, of a people from unknown proper name; only with article as collective noun with הַכְּרֵתִי (q. v.) of David's guard 2 Samuel 8:18; 15:18; 20:7, 23; 1 Kings 1:38, 44; 1 Chronicles 18:17.