Yup, Wikipedia can help you with your keyword research.
Specifically, you can learn how much traffic you can reasonably expect to get if you rank in the top 10 in Google for your target keyword phrase.
This is possible because we can know exactly how many searches a given wikipedia page is receiving for a given keyword phrase and Wikipedia pages generally rank in the top 10 of Google.
This is best explained in a video
Links from video:
But Nick, why do I care about this?
Choosing the right keywords in the right niche, building a blog and content, and ranking high in Google take an immense amount of time.
And it would be a shame if you went through all this trouble only to find that no one is searching for your keyword phrase.

