Arabic is on the Semitic branch of the hypothesised proto-Indo-European language, which has dual number: https://en.wikipedia.org/wiki/Dual_(grammatical_number)
replySo you'd expect to see languages from western Europe to south Asia that either have the dual concept, or have an attested ancestor that did.
The Semitic language family is not part of the proto-indo-european language family. It's from the Afroasiatic family
replyPersian is PIE and had influence over semitic languages in cultural contact. The connection could be there.
replyEgyptian had it, and although it's Afroasiatic it's not Semitic, so it must have gone back further than that.
replyWithin Indo-European languages, Irish has the concept of the dual. It's used with things that come in pairs like "mo dhá láimh" - my two hands.
replyInterestingly, to say one-handed you'd say "leath-lámh", where _leath_ means half, so half the <thing that's usually one of a pair>.
Semitic languages are Afroasiatic, not Indoeuropean.
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