Jewish Palestinian Aramaic

ḥad - one, someone, certain (DJPA 187)

PArm
*ḥad- - one (Kogan 2015: 399–400)
Outside Aramaic, aphaeresis of ˀa- in PS *ˀaḥad- ‘one’ is regular in some varieties of modern EthS (v. EDG 322 under Sel. Zwy. had).