PCS

*ṯamma - there (Kogan 2015: 202)

Contrary to a widespread opinion (AHw. 1272, HALOT 1546, DUL 913), neither Akk. šumma ‘if’ nor Arb. ṯumma ‘then, afterwards’ can be related to *ṯamma

Ugaritic
ṯm - there (DUL 913)
Hebrew
šām, šammā - there (HALOT 1545)
Old Aramaic
šm - there (DNWSI 1159)
Biblical Aramaic
tammā - there (HALOT 2007)
Jewish Babylonian Aramaic
tammān - there (DJBA 1213)
Syriac
tammān - there (LSyr. 827, SL 1653)
Turoyo
tamo - dort (there) (RW 512)
Arabic
ṯamma - there (Lane 350)