I found several sites that make clear that it is actually used in Vietnam. A few links:
http://mauricepatrickbyers.com/news.htmlhttp://www.travelpod.com/travel-blog-entries/mt05/vietnam05/1110294120/tpod.html
In the database of behindthename you can find:
LÀNH m Vietnamese
Means "peaceful" in Vietnamese.
LANI f Hawaiian
Means "sky, heaven" in Hawaiian.