Is a middle name important in the US?

Manuela
Hi I'm from another country but I've been living here in the US since 2011. I'm now having my first baby with my husband and I was just wondering how important it is to have a middle name for my little boy.
In our country it's ok if you have it or not but here seems to be a big deal. 
I just want to know.
Thanks :)

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