Viswanathan is not entirely easy to pronounce, but your inability to say it right, has more to do with your unwillingness to learn.
If Viswanathan was the name of a wine (Schwarzriesling), a region (Languedoc-Roussillon) or anything that belonged to a culture you aspire to (read West European mostly) – you would make the effort to learn it. Or if you were petrified of being seen as unrefined.
There’s (are?) enough White/ Black/ Brown people who can get the name quite easily – or at the very least – give it a shot. It’s when you stare at the characters, and claim you can’t even try – it makes me think of you as illiterate.
If you don’t get that – your brain is small, rather than the name being long. Thanks very much. /end rant.
PS – I don’t have a problem with mispronunciation, my issue is when a person refuses to even try. And this isn’t specific to an ethnicity or a people, those who encounter this, will come across it in any country, and across settings.