Middle name help!

We are struggling to decide on a middle name for our baby if it's a boy. His first name will be William, as it's been a name passed down to the 1st son for a couple generations. We will call him by his middle name though, because both his daddy and grandfather go by Will and it's confusing at times.

Our last name is Gantt so we want something that's more than 1 syllable that will flow well. We also have an Olivia Grace and want a name that sounds good when paired with Olivia. Our current top name is Alexander, to be called Alex. But we aren't 100% sold. Anyone have suggestions?