Our boy names if the twins had been boys were William, Andrew, Joseph, and Charles I just the the last in for good measure even though you obviously won't be using it.
I have a Charlie, and our other boys are Henry and Alexander. I love Bennett and lobbied for it for DS3. I love Elliott, too. I like Oliver, but I do find Ollie and Charlie to be a little matchy.
Other names I like:
James Patrick Samuel Alec Mark Reed Quinn Benjamin