Sebastian and William are very popular around here, too. Depends how you feel about popularity. Seth is the only one of your list that's quite rare.
I'd have hated being Simon 1 Simon 2 Simon 3 or Sarah F Sarah B Sarah M in school. Or worse, fat Jane, thin Jane, old John, young John. I know people who quite liked being one of the 3 Daniels in class and found it funny though.