Dr. Doomsduck said:
That is a wholly subjective definition, as both sides have garnished the same bad (or good) name. And that's not even accounting for the hijinks of language since the meaning of 'Nerd' depends on where you're born. For example In my country, the word geek is never used whereas the word Nerd is used to describe people who are eccentrically devoted to a particular subject, be they a study or otherwise. I think that people who identify themselves as 'nerd' are frequently the same people who identify themselves as 'geek' and to exclude one group from the other only creates more discord in an already fragmented group of people.
tl;dr You don't get points for semantics, OP meant the overarching term.
Unless of course you thought we were talking about carnival performers who perform sensationally morbid or disgusting acts, which is also a definition of geek. In that case, I apologize.
Now, as for answering the question, Daniel Jackson from Stargate, Wash from Firefly and Ami Mizuno from Sailor Moon.