Sorry, I am in a pissy mood today. :| But "which is" in no way means "what is it's origin". :| Only to you it does because you knew what you meant, I am not a mind reader.
1. I hate that word "whatever" It is snotty and people only say it when they are wrong.
2. You obviously have bad English, English is my native language, I think I know when something doesn't mean what you want it to.
3. Latin isn't a constructed language at all. On top of that, Latin is dead.
Then ask that! O.o "which is" does not in any way mean "Where is it's origin?" o.o
A linguist back in the 1800's constructed it out of all of the European languages to be an easy second language for people to learn. It's goal is to become a universal second language for easy communications between cultures.