Ezra or Lewis for Baby Boy

Having a hard time deciding between two boy names for our second little guy: Ezra or Lewis. For reference, our first son's name is Caleb. And last name is a short, one syllable.

Originally we had planned for his name to be Ezra Lewis (Lewis as a middle name). But now my husband is considering Lewis as his first name (we prefer this spelling over Louis) and I'm starting to really like the idea of Louie as the cutest nickname ever (please don't suggest Lewie, it's just spelled too odd!). Please help!