This may account for what is known as "exogamy," an almost universal marriage custom of primitive man, whereby a man named Jones is barred by frightful taboos from the women named Jones, but is permitted relations with all the women named Smith.
"The Book of Life: Vol. I Mind and Body; Vol. II Love and Society"
Upton Sinclair
The rule of exogamy is by no means strictly observed, and in Kawardha it is said that these three subcastes intermarry though they do not eat together, while in Balaghat the Bharotias and Narotias both eat together and intermarry.
"The Tribes and Castes of the Central Provinces of India Volume II"
R. V. Russell
In fact the rules of exogamy are so loose that an instance is known of an uncle having married his niece.
"The Tribes and Castes of the Central Provinces of India Volume II"
R. V. Russell