Hopefully I can help clear things up, and maybe make Greg's job a little easier.
In 2001, official LEGO material referred to the character as Loowah by pronunciation. This was swiftly changed, and not too long after, to Laywah by pronunciation.
There were fans calling him both Laywah and Leewah by pronunciation, but LEGO's view on it seeming shifted back and forth over the years. Then, in 2015, the G2 version of Lewa's name was solidified as Leewah by pronunciation.
So in other words, Loowah is outdated heavily, and Leewah and Laywah are both correct. Not sure why they chose his last name to be By Pronunciation, though...