I also have got a elder (is older both right??) brother by name of Roman.
Is the sentence correct? If not, why?
I've also got an older/elder brother by the name of Roman.
I've also got an older brother named Roman.
I'd say older would be used more often than elder.
My grandfather, an old-school prescriptivist, despised 'by the name of' as an Americanism. I believe he was right about the American influence, and I'd prefer to use 'named' myself. But 'by the name of' is widely used now both sides of the Atlantic.
Thanks for your replies!