I think James would be nice
That's the middle name I chose for my baby boy
Both my step dad and my dad share that middle name so I thought it'd be a great way to associate my little guy to two very important men in my life
OP, do you have any fathers, grandfathers, uncles... etc whose first or middle name could work for your baby? It's nice when the middle name has meaning, but can be tough when the names to choose from don't quite work with your choice.
I like Roy, John, Dean... just a couple of suggestions
1 syllable is difficult because a lot of 1 syllable names are nicknames, like Jim, Ben, Don... etc.