Pinyin:
* 比利 (Bǐlì): This is the most common and straightforward translation, directly using the pinyin for "Billy". It's a good option for general use.
* 比尔 (Bǐ'ěr): This is closer to the pronunciation of "Bill" and might be preferred for formal contexts.
Traditional Chinese:
* 比利 (Bǐlì)
* 比爾 (Bǐ'ěr)
Simplified Chinese:
* 比利 (Bǐlì)
* 比尔 (Bǐ'ěr)
Ultimately, the best way to spell "Billy" in Chinese depends on the context and the desired pronunciation. If you're unsure, it's always best to consult with a native Chinese speaker.