Welcome Elchanan Nissim.
Elchanan (which means "Grace of God") is for my husband's maternal grandfather who passed away in September. And we chose Nissim (which means miracles) because he was born between the holidays of Purim and Passover, he was born the day before the start of the Hebrew month of Nissan, the fact that he was a happy surprise and there was a bit of drama during his labor and delivery that we're thankful we got past.
We'll probably mostly call him Eli (EH-lee, as opposed to ee-LI).
Nati is actually warming up to him. So far he hasn't tried to smack him around.
(The mohel we used is Rabbi Hillel Brenner, an American recently of Har Bracha, currently from Shilo. Really nice guy, did a good job).