You are right in that there is no real official correct names for anything, its basically just lists of synonyms, but there is still an order to it. I don't know anything about 'Kalela', but if it is a sport of 'Dwarf Brazilian' (there are actually quite a few different forms even), then it would not be synonymous with 'Hawaiian Apple' because being a sport, it should be different, and thus 'Kalela' is a perfectly fine name.
I have really slow internet and can't do the type of searches and research I would normally be able to do, so check out the MGIS and see if you can find any info.
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