1. As a Chinese character:
* huan (欢) means joy, happy, delighted. This is the most common meaning. For example, "huānhū" (欢呼) means "cheer, shout for joy".
* huan (环) means ring, circle, loop, cycle, surround. For example, "huánjìng" (环境) means "environment".
* huan (还) means return, give back, still, yet, also, repay. For example, "huánqiān" (还钱) means "to repay money".
* huan (换) means change, exchange, replace, alternate. For example, "huànqiān" (换钱) means "to exchange money".
2. As a Vietnamese surname:
* Huân is a Vietnamese surname, sometimes spelled "Huan". This would be pronounced as "hwan" with a long "a" sound.
3. In other languages:
* Huan may also appear in other languages, such as Spanish, where it could be a name or a word with a specific meaning in that language.
Without more context, it's difficult to determine the exact meaning of "huan". If you can provide more information, such as the full word or phrase, or the language it's from, I can give you a more specific answer.