why are so many elderly men named "Bahadur Singh" in UK ?

Hi guys, I have noticed that UK has a lot of Bahadur Singhs on its soil. My dada had the same name and I was wondering about the story behind these men, why was/is this name so fashionable ? are couples still naming their boys "Bahadur Singh"? The security guards in my college are also "Bahadur Singhs', but most of them are nepalis i presume