Oh, that's really hard - I would genuinely say almost any, reasonably popular, British name is similar to that list!
Umm ...
Most like Frankie and Charlie:
Alfie, Archie, Albie, Benji, Bobby, Billy, Eddie, Freddie, Harry, Jamie, Jonty, Mickey, Nicky, Ollie, Robbie, Sammy, Solly, Tommy, Timmy, Vinnie
Most like George and Louis:
Albert, Benedict, Charles, Elliot, Edward, Frederick, Henry, Joseph, John, Jonathan, James, Lucas, Matthew, Mark, Michael, Nicholas, Nathaniel, Patrick, Peter, Richard, Robert, Stephen, Thomas, William, Xavier
Most like Ellis:
Arlo, Caleb, Dylan, Ethan, Felix, Harvey, Jacob, Jesse, Liam, Milo, Nico, Noah, Oscar, Quinn, Reuben, Zach