Personally, I love the name Anakin and I don't think of it as being evil or negative...Vader is a little more out there...MAYBE as a middle name (because later in life you usually ony need to use your middle initial, not full name). It definitely seems dark and evil.
I have definitely heard of worse names.
People are named after movies, TV shows, stars all the time! We named our daughter Lorelei and call her Rory (form the Gilmore Girls, but they spell it Lorelai). I like the show, but we picked the name becasue we liked the name, not because we are die hard Gilmore Girls fans. It is a real/existing name, but not so common...she is the only one we know personally.
I think if I ever have a boy I want to name him Karsten. I'm sure he'll spend a lot of time saying, "no, not Carson." And pooksma, I LOVE the name Declan too! I know a Declan and have loved his name since first I heard it.
Good luck in choosing a name.