My dad says it like 'ONvelope'...*shudders*

Onvelope makes me cringe..

I sometimes interchange them, to be honest. EN does generally sound better but I'm so used to ON as well that it does not really bother me to hear or say. Sometimes I do stop and go, "Hmmm...it probably should be ENvelope!"

I do say onvelope, but I say envelope too. They both sound right to me.

i hate when people say ONvelope! im like "r u stupid?? it starts with an e not an o!"

ENvelope for me. It sounds waaaaay cuter and less fierce than... ONvelope. Good Lord. xD