Arabic

ḥawl-/ḥayl- - strength, power, might (Lane 675, 688)

Also ḫayl- ‘horses; riders’ has often been considered a cognate (cf. Marrassini 1971:59)

PWS
*ḥayl-/*ḫayl- - strength (Kogan 2015: 118)
The discrepancy between ḫ and ḥ still awaits an explanation, but there is little doubt that all or most of the aforementioned forms go back to a single etymological source. Contra HALOT 311, CDG 269 and many others, there is hardly any connection between this root and Akk. illatu ‘kinship group, clan; army, troops’