-ain

(Engels)

1. (masculine, morpheme) suffix used to form noun (uppercase) demonyms
2. (masculine, morpheme) suffix used to form adjective (lowercase) demonyms
3. (masculine, morpheme) indicates the old oblique case (cas régime) of certain nouns

Uitgespreek as (IPA)

/ɛ̃/

Etimologie (Engels)

Geërf van Old French: -ain

Geërf van Latyn: -ānus

In summary

Inherited from Old French -ain, from Latin -ānus, whence also French -an and -ien.