PWS

*ˁlg - to stammer (SED I No. 2ᵥ; Conti 1990: 94)

Ebla
a-a-gú li-sa-nu - Sum. EME.LÁ (‘one with stammering tongue’) (Conti 1990: 94)
Ugaritic
ˁlg - tartamudear (DLU 77)
Ugaritic
tˁlgt - stammering (Gordon 456)
Hebrew
ˁillēg - stammerer (HALOT 828)
Formed after the well-known ḳittēl pattern for adjectives denoting physical defects.
Arabic
ˁilǯ - strong man; foreigner, non-Muslim (BK 2 339, Lane 2128)
possibly related
Tigre
täˁalaǯäǯä - to stammer (WTS 454)