IMHO realistically for most people the ratio between "your own ideas" and everything else should be like 5% or so. If you're exceptionally gifted maybe up to 20%.. (unless you're writing fiction)
I'd say it's yours. In that frame, there are lots of ideas.
Lets assume there are 10 000 known ideas. Then there's 10^8 combinations of two ideas, and 10^12 combinations of three ideas. That's a lot of ideas, even for the internet! I bet not all of them are named. And different people are going to frame ideas differently.
I also believe trying to form your ideas in reference to existing knowledge is a great way to learn existing knowledge.