Probably from daqar with a prepositional prefix; by stabbing, i.e. Assassin; Bidkar, an Israelite -- Bidkar.
see HEBREW daqar
H920. Bidqar
בִּדְקַר proper name, masculine Israel officer 2 Kings 9:25 (see בֵּן).
בהה (compare Arabic be empty; on a possible connection in Assyrian compare HptBAS i. 18).