Ain is an uncommon family name found today in England, the United States (particularly New York City), New Zealand, Sweden, Spain, Turkey and Israel. Because the name occurs in the Old Testament, it has been suggested that the name has Jewish origins since it is mentioned in the Bible four times. However, the Jewish Genealogical Society of Great Britain have no records of this as a Jewish Surname. The Consolidated Jewish Surname Index of U.S.-based Avotaynu indicates Adin is a Jewish surname that existed in Poland and Belarus. But this may be a phonetic coincidence since a name with so few letters might exist in every culture.