Hi OP,
Cedric - to me sounds old fashioned, but old fashioned names seem to be making a comeback in the UK!
Chester - there's a place called Chester in the north, but I don't particularly associate the name Chester with the place. I think it sounds quite modern.
Ivan - I'm not too keen on this, also I think people could make jokes on the name take the MN user name ivanapoo!
Kieran - I like this name best :)
Laszlo - I like this too, sounds Italian to me?
Malcolm - reminds me of the American show Malcolm in the Middle, the only two Malcolm's I know in real life are middle aged, but again, old fashioned names seem to be rising in popularity.
Marshall - this has a similar ring to Chester to my mind, nice, sounds modern.
Maurice - I asked my DH if he'd like this name if we have another boy! I prefer the spelling Morris, but that's more of a surname spelling I think. I like it!
Munro - this sounds modern to me, I've not heard it as a name before, but I think it must belong to some people!
Rye - I'm not keen on as a name on it's own, maybe as a nickname for Ryan, but otherwise it makes me think of rye bread - sorry.
Trevor - sorry but this reminds me of evil Trevor on Eastenders! I do know a very nice Trevor in real life though :)
Quite an interesting mix of names! Go for what you like best, other people will learn to like the name you choose and they will associate the name with your baby, so don't worry what other people think!
Congratulations by the way :)