New Delhi, Sept. 5 -- Zerodha founder and CEO Nithin Kamath marked his younger brother Nikhil Kamath's 40th birthday with a childhood photograph, a few memories and a joke about a mix-up that has followed the brothers for years.

Sharing the throwback picture on X, Nithin recalled how people once regularly mistook Nikhil for him. But the situation appears to have changed in recent years, particularly after the success of Nikhil's WTF podcast.

"For many years, people called Nikhil "Nithin." But over the last 3-4 years, with the success of WTF, I've been called Nikhil exponentially more. Forget people just calling me Nikhil in person; I now get emails, LinkedIn messages, tweets, etc., addressed to Nikhil every day.��​"...