The Invisible Man's family name was
Griffin, but there is some
confusion over his first name. In the movie "The Invisible Man" from
1933 he is named Jack, in "Invisible Man's revenge" from 1944 it is
Robert. Of course, the definite authority in this matter must be
H. G. Wells himself, and he named the invisible man Hawley Griffin,
as did
Alan Moore in "
League of Extraordinary Gentlemen".
There was yet another invisible man named Dr. Frank Griffin, but he is
the brother of the original one and appeared in the 1944 movie
"Invisible Man Returns".