There are a lot of good options already, and @Adriana Morris gives advice I like, but I did get an A2A (thanks), so I'll just add one more thing: watch out for names of existing people. There's nothing wrong with the sound of Richard Nixon or Richard Dawkins, but they will get strong negative reactions depending on the politics or religion of the people hearing them. And Richard Lionheart, while an actual Englishman, is not actually a safe choice. Richard Feynman (physicist), on the other hand, will serve you well among Quorans ;).
