I would learn how to pronounce the name. I get annoyed when they mispronounce my name at the stores. Its a good English name, and living in the states, you'd think they would at least know how to pronounce it. One 'n' makes the vowel long, two makes it short. So easy! But they still get it wrong.
If it upsets me, I can imagine how a god would feel. Pretty upset I would say. Take the time to learn it. Its not that hard. Just my thoughts