Carl Linnaeus first classified us as Homo sapiens in 1735. Human on the other hand, can be used to describe any of the Homo species, extinct or extant.
Homo sapiens first evolved in Africa around 200,000 years ago.
There is at least two known independents hybridization events in our species history. This is evident in our DNA. Europeans interbred with Neanderthals, and people in Siberia interbred with Denisovans.