I’m not sure I see the difference. Alexa has to understand your pronunciation. Unless you mean Alexa has trouble understanding you in general, but not other people?
Either way, I agree with what’s been suggested above that trying to spell her name as phonetically as possible may help. Like Uhlane, for example.
While naming things numerically may be easier for Alexa to understand, I agree that for many homes it will make things harder for the humans, defeating the purpose of spending all this money to make our homes smarter. But obviously whatever works for each home differs on a case by case basis.