My first thought when reading this name is the character from the sitcom Fresh Prince of Bel-Air (starring Will Smith), the butler (though I admit I do not know if his name is spelled this way or the other way). Even so, it is not a negative association, and certainly not one most kids nowadays would be familiar with.
Geoffrey Jellineck (played by Paul Dinello) was a character in the short-lived sitcom "Strangers With Candy." He was a high school art teacher who had a not-so-secret affair with the history teacher, Chuck Noblet (played by Stephen Colbert).