How do you spell the name Megan in Chinese?
Romanized it would be "Mei Gen" only because the sound is similar to the English. This gives a lot of varity because there are many characters with the similar sound. Each character has a different meaning, which makes each name special.
There is no good website to learn how to spell your name in Chinese, for you can't spell your name in Chinese, you have to use strokes. But strokes don't mean anything! They just make characters by grouping together to make a character. One stroke and another grouped with others could mean "moon", and those same strokes added with others could mean the exact opposite!