History:

It likely happened gradually, perhaps following old trade routes and people moving around within India. The surname might have changed slightly in spelling and pronunciation depending on the area, reflecting local dialects. Its distribution is probably a complex mix of things happening over many years.

Description:

Ramanujam: This surname is mainly found among Tamil Brahmin families in South India. The name is strongly connected to the famous mathematician Srinivasa Ramanujan, suggesting a history of scholarship in families with this surname. While it might appear elsewhere, its most commonly associated with Tamil Brahmins. There might be slightly different spellings, but the connection stays the same.

We see simpler versions like Ramunujam and Ramanuj, and even a slightly different spelling like Ramunujan. Its interesting to see the variety.