Gulf Arabic Grammar - Plural-forming
suffix "-iin"
Plurals
which do not have a broken plural and signify male humans (usually
members of a profession, occupation or nationality), add –iin.
mudarris
(male teacher) -> mudarrisiin
mu7assin (barber) -> mu7assiniin
ba7rayni
(male Bahraini) -> ba7rayniyyiin
ingiliizi (Englishman) -> ingiliziiyiin
Note
that that when the singular ends in –i an –yy- is
added before the plural siffix –iin.