If you have an Amazon Dot, I guess it's possible to change it so you don't have to call it Alexa!
1. Open the Amazon Alexa app.
2. Tap the three line menu button.
3. Scroll down to and tap Settings.
4. Tap on the Echo device you want to change.
5. Tap Alexa.
6. Tap the down arrow next to Alexa.
7. Select Alexa, Amazon, Echo, or Computer,
8. Tap Save.