My wild uneducated guess about Monticue, is that it could be a respelling of
Montague, invented by a US
Montague family who did not want their name to make people think of
Romeo &
Juliet. Or maybe they didn't like people mispronouncing
Montague as "Mon-TAG." I've heard of surnames being respelled for trivial reasons like that, before, anyway. "MON-ta-ghew" is the usual English pronunciation of
Montague.
I think if you meant to use a recognizable but somewhat unusual name, you probably want
Montague. It's been used for more things than just R&J and would not seem weird to use for a minor character.
Monticue kind of reminds me of barbecue, and as a reader I think it'd distract me by being so similar to
Montague.
- mirfak