To, Tô, and Tō are a group of surnames of east-Asian origin, for each of which "To" (without any diacritical mark) is at least an occasional variant.
From Chinese 陶 (Tao):
- Tô, the Minnan romanization of the name
- To, the Cantonese romanization for the name
- Tō, the romanization of the Japanese surname 陶, which is derived from the (same Chinese) name