Some things never change, eh?
A friend of mine, often pronounces certain words
You can pronounce proper nouns however you want.
A-hem. No, no, not that one! I mean like the sound you make when clearing your throat. Of course, that's more like Ghhmhhmghm, but I digress.
So, where was I? Right.
A-hem. No, you cannot pronounce proper nouns however you want!
Take the case of a name, like 'Rajesh' (that's my name, in case you were wondering). My name has a specific pronunciation, and pronouncing it "Rahash" - "j" is pronounced "h" in spanish/latin/mexican - would be wrong.
Similarly, it is not okay to pronounce the Indian name Dhillon, as "Dhee-yo-n", even if Quesadilla is pronounced as "Ke-sa-dee-ya". "Amit" is "A-mih-t", and cannot be pronounced "A-mite" or "Aim-it". "Iraq" if pronounced "Eye-Rack", is being pronounced wrong, even if it's being pronounced by the President of the United States of America!
Names derived from new additions to the English language are all the more problematic, since you often see the words in print long before you actually hear them. The "Wiki" in Wikipedia, is pronounced "Wih-key", not "Why-key". (On a related note, if you do decide to use the term "LOL" in real speech, then it's pronounced "Ell-oh-Ell", not "Lole"! Of course, I would recommend actually laughing instead.)
A proper noun is a name, and mangling someone's or something's name is not polite - to say the least.
So, the next time any of you decide to change the pronunciation of any so-called "Proper Noun", do consider taking the permission of the owner of that name.