PLEASE HELP ME WITH THIS NAME

Hey everyone, I'm 33+4 and I'm having a little girl. We have decided to call her Evy, pronounced EH-VEE. A lot of people keep pronouncing it as Evie (EE-VEE). So I'm here to ask;
1. How would you pronounce Evy.
2. Is there any other way I could spell Evy to sound like EH-VEE?
To me personally I look at Evy and think EH-VEE, I don't know where people are getting the long e sound from? Like you don't pronounce Evan as EE-VAN it's pronounced EV-AN so I don't understand the confusing with some when I say Evy is EH-VEE.