Toby is a popular male name in many English speaking countries. The name is from the Middle English vernacular form of Tobias. Tobias itself is the Greek transliteration of the Hebrew Toviah, which translates to Good is Yahweh. Yahweh is the name of the Jewish national god. Tobit is also an alternate form of Tobias.
It is also used as a contraction of Tobin, an Irish surname now also used as a forename)