Thanks for all the feedback. It's always interesting to hear how people perceive different names and the associations they have with them.
Regarding, trevor, I don't know anything about Eastenders or the Trevor and Wayne reference, but some of you actually liked the name, which tells me it isn't completely off-limits.
I'm not really worried about any of these leading to bullying -- if someone wants to bully a kid, they'll find an excuse, if they even think they need an excuse. I'm also not worried about associations like Ivan the Terrible; no one advises against naming a kid Jack because of Jack the Ripper, right?
DS will have three nationalities, one of which is American, so "American" sounding names don't bother me too much, although it is good to know which ones stand out as undoubtedly American.
Laszlo is far from a made-up name: it's very popular in Hungary, and there is Hungarian ancestry in our family. It's actually my second top choice after Cedric.
And Cedric originated as a literary name in Sir Walter Scott's Ivanhoe. Someone pointed out the Harry Potter connection, but since that was only one of you out of more than 30 replies, I think it's safe to assume most people won't associate it with HP.
And no one, LOL, pointed out that Trevor is Neville Longbottom's toad in Harry Potter. :)
Thanks again!