Re: Tom Paris or Nick Lacarno?
There's also speculation that the reason Locarno became Tom Paris was the writer of "The First Duty", who created the character, would have to be paid a royalty for every Voyager episode with Locarno. I suspect this is the real reason for the switch.
Curly: Moe, Larry, the cheese! Moe, Larry, the cheese! (Horses Collars, 1935)