I really dislike names which sound much more like a surname than a forename, except when a family surname is used as a middle name. I think both Finton and
Benson do sound more surnamey, but of the two I prefer Finton. Saying this I do quite like
Byron because of the poet.
There are many definite forenames which end in a -en/-on sound, such as
SimonSimeonFaolan (which could use the nn
Finn)
AntonBrianChristianCiaranCameronDarrenDylanEuan/
EwanIanJonathonSebastianStephenTristanVivianOr even
Fionn, which I really like as a fn in its own right.
Good luck!
Freddo xx