Even though I recognised the derivation immediately, Marcantony just looks like "
Marc and
Tony" to me.
I do think that as one word Marcantony is a mix of pretentious and ignorant.
Marc Antony looks much better but honestly I think it's also still pretentious. Which is fine, if that's what you look for in a name!

http://christineseaforthfinch.blogspot.com/