Of Greek origin.
Dwight was an English surname that was derived from the Medieval feminine name “Diot”.
Diot was a short form of the Greek name “Dionysia”, from the masculine name “Dionysios”.
Dionysios is a Greek name, from the Greek mythological Dionysos, the god of ecstasy, grape harvest, wine, and fertility.
Dwight is not ranked in the top-1000 baby names in the U.S.A. The names’ best ranking place was in 1953 when it was #122.