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It's like Porsche. There's the actual right way to say it, and there's the way most Americans actually do say it. You can tell them all they're wrong but y our job will never end, so just say it your way and hope the rest figure it out.
Being fluent in the Serbian/Croatian language of Nikola Tesla myself it is correct to say tess-la. The "a" is short, so it is better than usual "tess-lah". Nikola is pronounced with emphasis on the "i".