From כׇּל (kól) + ־שֶׁהוּ (shehú).
כׇּלְשֶׁהוּ • (kólshehu) (feminine singular כׇּלְשֶׁהִי, masculine plural כׇּלְשֶׁהֵם, feminine plural כׇּלְשֶׁהֵן)