I would give him a Nepali name (as you know Barack Obama is doing well with his name). But, try to make it easy for others to say his name. Once you have top 5 names, ask your American friends whether they can pronounce easily/correctly. You should avoid Nepali names that sound funny when you hear in English (search a sajha thread for more.. at least one was posted recently). For example, use Beni Bahadur in Nepali and it can be Ben in short. don't use bed prasad or Badri as you know Bed/Bad doesn't sound good in English. Also, I would use short first name if your last name is long and vice versa. Good luck.