I instinctively pronounced it like "air-LAY-va" in my head - not sure if that's anywhere close to correct, but I think it's lovely.
I thought I'd seen this name somewhere in my medieval Wikipedia wanderings, so I checked and I was right: this was the name of
William the Conqueror's mom! That's fun.
Herleva Emily is really standing out to me. It's got a warm magic to it, very homey.
PS I am absolutely gaga over
Arlette, what a fantastic name