What does the Chinese name 夜華 (ye hua) mean?

夜：means night.
華：Basically, this word must be combined with another word to make a clear meaning. There are too many phrases that contains the word of 華. The most simple one is “Republic of China/Taiwan – 中華民國”.
“夜華” is a suitable name for both man and woman. And, “夜華” is also the name of the leading actor in an fiction novel broadcasted by TV here in China and Taiwan now.
Oh, “夜華” doesn’t have specific meaning, but it’s suitable to be a name.

Excellent answer from Simon, not sure if this is a full name or not, as while 夜 means "night", it is also a fairly common surname/family name. 華 has very broad meanings, as he mentioned--it is very common and well-liked for girls' names--it can mean peerless quality / magnificient ,and is used as a contraction for "Asia (China specifically)[sourced].

Nighttime