[cobrophy]

Is there any way to change it?

I imagine if your name was Alexa (or even Alex) or had a close friend with that name you could also get a lot of false positives.

[genericuser]

You can easily change it to Amazon if you do not want it to be Alexa. However that is your only other option.

[mikeflynn]

You can change it, but the only other option is to have it respond to "Amazon."

[pbreit]

The only other current option is "Amazon".