MoL is indeed canon, however it has many inaccuracies.
I think this makes a good point and kind of questions whether the encyclopedias really are a good source on this matter. Also, as Ghidora pointed out, it has changed a lot in media.
Once again, I pose the question: How does one pronounce the word "lewa" in Hawaiian?
Honestly, I don't think there's really a solid answer, and imo, all three are correct; perhaps different characters pronounce it differently?