Theodore is less common than Noah, especially in my area. I wasn't paying much attention to popularity when we named our DS; we just both really liked the name and had never met anyone in RL named Noah. DH's fn is John, so we were actually trying to avoid the whole 6 kids in class with the same name scenario. In 2003, when DS was born, Noah ranked 32 in the US, while Theodore ranked 313...still popular, but not as wildly so as Noah. So statistically, the chances of there being a lot of Teddys in his class are lower than the chances of there being other Noahs.