Whether or not Rev. Wright was correct in saying that 'damn' was derived from 'condemn', I think he probably came by his understanding of the word's etymology honestly. I have two books of word origins. One of them gives the same etymology as the OED, and the other gives the same etymology as the one Dr. Wright gave.

This is what it says:

Though it is first recorded in the 16th century 'damn' is a much older oath than that. It derives ultimately from the Latin 'damnare', to condemn.