In this episode, it is said that Lamont has no first name and Lamont is his middle name. However, in the first season episode Here Comes the Bride, There Goes the Bride (1972), during his wedding, the minister refers to him as Lamont Grady Sanford.
In the episode, "The Lucky Streak", it was revealed that Lamont has no first name. "Lamont" is his middle name because Fred and Elizabeth couldn't think of a proper first name for him.