PCS

*rbb - to be large, numerous (Kogan 2015: 196)

PS
*rby - to be large (Kogan 2015: 196–197)

Ugaritic
rb - great, large (DUL 727)
Ugaritic
rb - chief (DUL 728)

Also rbt ‘lady’ (DUL 731).

Phoenician
rb - lord (DNWSI 1045)

Also rbt ‘lady’.

Hebrew
rab - numerous, many; great (HALOT 1171)
Hebrew
rbb - to be numerous (HALOT 1175)

Cf. Cf. rōb ‘quantity, wealth‘ (HALOT 1174).

Old Aramaic
rbrb - big, large (DNWSI 1058)
Pl. rbrb-n
Biblical Aramaic
raḇ - great (HALOT 1975‒1977)
Pl. raḇrəḇīn
Jewish Palestinian Aramaic
rab - great, large (DJPA 511)
pl. rabrəbīn
Jewish Babylonian Aramaic
rab - great one, great thing (DJBA 1052)
Syriac
rabbā - great, large (LSyr. 706, SL 1452)
Pl. rawrbe
Syriac
rbb - to become great, be great (LSyr. 706, SL 1425)
Mandaic
rab - master, the greatest (MD 417)
Turoyo
rabo - groß (big) (RW 430)
Arabic
rabb- - lord, possessor (Lane 1003)
Arabic
rbb - V. to be collected, congregated (Lane 1003)
Arabic
rubba-mā - often (Lane 1003)
Arabic
rabab- - much water (Lane 1003)