Having two siblings with the same middle name?!?

Casey • Mommy to my adorable son Cayden Wayne
My SO & I don't know what we are having yet, we find out in a week. The other night we were talking about names & he says if it's a girl he wants the middle name to be Marie just like my step daughters middle name. I told him why he wanted them to both have the same middle name & he said so they share something together. I told him I didn't really care for it. Why have two siblings with the same middle name, it's just sounds like we put no thought into, but i told him I would think about it. Am I wrong hating the name suggestion? 

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