10. Exogamy and rules regulating marriage.
Most subcastes have an elaborate system of exogamy. They are either divided into a large number of sections, or into a few gotras, usually twelve, each of which is further split up into subsections. Marriage can then be regulated by forbidding a man to take a wife from the whole of his own section or from the subsection of his mother, grandmothers and even greatgrandmothers. By this means the union of persons within five or more degrees of relationship either through males or females is avoided, and most Banias prohibit intermarriage, at any rate nominally, up to five degrees. Such practices as exchanging girls between families or marrying two sisters are, as a rule, prohibited. The gotras or main sections appear to be frequently named after Brāhman Rīshis or saints, while the subsections have names of a territorial or titular character.