Your relative may not have had a middle name. My uncle Chris Ehmen indicated that on his draft registration card–where it is indicated that he had no middle name. While middle names were common by the time Ehmen was born in 1902 not every one had one. It’s possible your relative did not as well.
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My mom didn’t have one. She was born on a farm in western North Dakota. Wasn’t important.
When I asked my uncle to allow me to get his records, he filled in NMI (no middle initial). I’ve also come across a friend of the same uncle who, for reasons of her own, created a family tree for my uncle and his wife. She had filled in some surname fields with “MNU”. All her surname fields were all-caps, but I knew that all of those people with that surname weren’t related, so I was very confused. I eventually figured out that it meant Maiden Name Unknown.