Originally Posted by Sai the Dreamer
"Sola" is in fact a spelling error of "Sora". I believe this to be the case, given that the Japanese have, in prior times, accidentally replaced r's with l's when romanising words.
It is not really a mistake.
Romanising Japanese just means turning Japanese words into pronouncable roman characters. Given that neither the letter L nor the letter R exist in japanese, it can't really be correct or incorrect either way. R sounds tend to be favoured when romanising, but that is just an arbitrary convention.
In Japanese the sound that is closest to our R is sort of part way between L and R in terms of pronounciation. Since they use the same character for both, the Japanese have difficulty pronouncing Enlish words where the sound is definitely an L or an R, not a mix of both - hence the term 'Engrish'.
It is the same as the French not being able to pronounce 'h' properly ( 'ouse' instead of 'house', etc.).
When English speakers try to speak in other languages, there are also a myriad of sounds that we can't hear or pronounce properly.