PS

*bVkVr- - firstborn (Kogan 2014: 91)

Akkadian
bukru - firstborn (CAD B 309, AHw. 137)
Ebla
bù-ku₁₇-lu, bù-kà-lu, bù-kà-ru₁₂ - firstborn (VE 270; Krebernik 1983: 13)
equated to Sum. DUMU.SAG
Ugaritic
bkr - firstborn (DUL 210)
Phoenician
bkr - first-born (DNWSI 164)
Hebrew
bəkōr - firstborn (HALOT 131)
Jewish Palestinian Aramaic
bakkīr - early, first rain (DJPA 103)
Syriac
bukrā - firstborn (LSyr. 73, SL 126)
Mandaic
bukra - first-born (MD 55)
Arabic
bikr- - firstborn (Lane 240)
Sabaic
bkr - firstborn (SD 28)
Qatabanian
bkr - firstborn (LIQ 26)
Geez
bakʷr - firstborn (CDG 94)
Tigre
bəkər - first-born (WTS 290)
Tigrinya
bäkʷri - first-born (TED 1171)
Amharic
bäkwər - first-born (AED 925)
Ezha
bäxər - first-born (EDG 136)
Endegen
bäxər - first-born (EDG 136)
Ennemor
bäxər - first-born (EDG 136)
Gyeto
bäxər - first-born (EDG 136)
Muher
bäxər - first-born (EDG 136)
Gogot
bäxər - first-born (EDG 136)
Soddo
bäkər - first-born (EDG 136)
Mehri
bēkər - firstborn (ML 46)
Soqotri
bέker - a grown up female goat (three years or more) (LS 86; CSOL I 513; CSOL II 431)
Soqotri
bέker - for the first time (LS 86; CSOL II 431)

in the phrase men bέker

Soqotri
bekέro - to give birth for the first time (a goat) (LS 86; CSOL I 513)