Hebrew

paḥad - thigh, haunch (HALOT 923)

Probably related. There is a tradition of translating this word as ‘testiculus’ (a discussion supporting this opinion see in [Pope 272]).

PWS

*paḫiḏ- - hip, thigh (SED I No. 211, Kogan 2011: 225)

On the semantic shift ‘hip, thigh’ > ‘tribal union’ see Kogan-Militarev 2003 295-296.