הגלבים is a hapax legomenon appearing in Ezekiel 5:1
וְאַתָּ֨ה בֶן־אָדָ֜ם קַח־לְךָ֣ ׀ חֶ֣רֶב חַדָּ֗ה תַּ֤עַר הַגַּלָּבִים֙ תִּקָּחֶ֣נָּה לָּ֔ךְ וְהַעֲבַרְתָּ֥ עַל־רֹאשְׁךָ֖ וְעַל־זְקָנֶ֑ךָ וְלָקַחְתָּ֥ לְךָ֛ מֹאזְנֵ֥י מִשְׁקָ֖ל וְחִלַּקְתָּֽם׃
And thou, son of man, take thee a sharp knife, take thee a barber’s razor, and cause it to pass upon thine head and upon thy beard: then take thee balances to weigh, and divide the hair.
According to Tawil, the word in from Akkadian gallābu, meaning a barber.