PS

*ˀarbaˁ- - four (Kogan 2009: 73)

Akkadian
erbe - four (CAD E 255)

f.abs. erbet(ti); f.rect. erbettum; erbâ/ê 'fourty'.

Ugaritic
ˀarbˁ - four (DUL³ 92)
Phoenician
ˀrbˁ - four (DNWSI 101)
Hebrew
ˀarbaˁ - four (HALOT 83)
Jewish Babylonian Aramaic
ˀarbaˁ - four (DJBA 163)
Syriac
ˀarbaˁ - quattuor (four) (LSyr. 708)
Syriac
ˀarbaˁ - four (SL 94)
Mandaic
arba - four (MD 36)
Turoyo
arbaḥ - vier (RW 157)
Arabic
ˀarbaˁ- - four (Lane 1019)
Sabaic
ˀrbˁ - four (SD 113)
Geez
ˀarbāˁ - four (CDG 460)
Tigre
ˀarbaˁ - four (WTS 153)
Tigrinya
ˀarbaˁtä - four (TED 567)
Amharic
aratt - four (AED 1151, Ludolf 57)
Argobba
arbit - four (Leslau 1997:193)
Argobba
arbit, ḥarˁətt - four (Leslau 1997:193, AAD 276, Wetter 2010:269)
Harari
ḥarat - four (EDH 87)

Also in Ancient Har. ḥarˁat (Wagner 1983:290)

Selti
arat - four (EDG 92)
Wolane
arat - four (EDG 92)
Zway
arət - four (EDG 92)
Gafat
arbattä - four (Leslau 1956:182)
Chaha
arbät - four (EDG 85)
Ezha
arbät - four (EDG 85)
Endegen
arwəˀat - four (EDG 85)
Ennemor
arḇˀat - four (EDG 85)
Gyeto
arḇˀät - four (EDG 85)
Muher
arbät - four (EDG 85)
Masqan
arbät - four (EDG 85)
Gogot
arbät - four (EDG 85)
Soddo
arätt - four (EDG 85)
Soqotri
órbiˁ - four (LS 73, CSOL II)

with feminine nouns