Syriac

ḥaḥḥā, ḥōḥā - plum tree (LSyr. 226, SL 441)

PWS
*ḫāḫ- - plum tree (Fronzaroli 1969: 7, 25, 33)
The form should be probably postulated for PWS level, since there are chances that Akkadian ḫaḫḫu is a West Semitic loanword, s. Kogan 2012: 255