Albert Barnes Commentary Joshua 17:5

"And there fell ten parts to Manasseh, besides the land of Gilead and Bashan, which is beyond the Jordan;" — Joshua 17:5 (ASV)

Ten portions – that is, five for the five families descended from the male children of Gilead, and five others for the five daughters of Zelophehad, who represented the sixth family, the Hepherites.