Definition: Gallaudet; Gallaudet University; Thomas Hopkins Gallaudet (1787–1851), U.S. educator of the deaf.
The original name sign refers to Thomas Hopkins Gallaudet (1787-1851) who wore eyeglasses. That's how he got his name sign.
Interesting, there is a name sign for Edward Miner Gallaudet, the son of Thomas H. Gallaudet. This sign name was seen signing by George Veditz in his 1913 film, "The Preservation of American Sign Language".