takes sg. pron. suffixes inasmuch as it is a fem. plural form

See also s.v. byt, byny. Note that in LJLA it occurs only in TargProv and one time each in TgPsJ and MegAntioch where the meaning is clearly "among".
This is the plural form of byt prep., and in many Syriac texts there is a clear distinction between the use of byt for "between" and bynt (usually with syāmē!) for "among", hence we have here separated the two. Elsewhere the two may be used in close context simply for variation.
In Mandaic this form appears to be used in complementary distribution with binia when used with pronominal suffixes.