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This site can help you since you can check if your made-up name collides with some known real-world name. For more in depth answers on how to make truly original fantasy names you can ask on the writers board here or consult one of these two stackexchanges: https://conlang.stackexchange.com/ (Constructed languages, there is for instance this question with answers: https://conlang.stackexchange.com/questions/1182/how-to-make-names-in-a-conlang ) or https://worldbuilding.stackexchange.com/ (World building, they have a tag names with 72n question at the time of this writing).