Emmanuel just looks too long and too similar to
Emma.
I like
David Emanuel and I also like
Emanuel David. Maybe people find Em/m/anuel too uncommon or too "girly" (I hate that expression) as fn. But I also like the form
Manuel.
Manny seems like the obvious nn.
"But it’s all right now.
I learned my lesson well.
You see you can’t please everyone
So you got to please yourself."
Rick Nelson,
Garden Party
"It does not become me to make myself smaller than I am." (
Edith Södergran 1891-1923)