This was a no-brainer ...
It was gonna be George or Mary - depending on gender. Named for Great Great Grandparents.
George VI, Queen Mary, Elizabeth, and Margaret did not desert the British Isles during WWII. In doing so, they endeared themselves to their British subjects.
The people remember, and by naming the baby George [Mary if it was a girl], the royal family just bought a lot of good will with the people ...