I test this stuff out sometimes on my friend John. He's a PhD materials scientist. He's no dummy, and uses a computer in his work every day.
He doesn't know what a wiki is. Nor a blog. I'm sure he's used both, but he doesn't recognize the words.
If you are targeting materials scientists, you might not want to use the word "wiki". If you're targeting teenagers or linux gurus, it might be a big plus.
You might want to consider registering it as a .org, if appropriate. Most of the most popular wikis are .orgs. .org reinforces the "open community" aspect of the wiki. Register the .com and .net if available, and redirect them to the .org.
FWIW, I am developing a wiki which is a kind of directory. I registered a brand name as a .com. No "wiki" in the name. I don't think my audience will know what a wiki is or care.
On the other hand, I think "wiki" in the name would make sense for, say, users of a particular software package - particularly if it's a techie tool. When people want information on such, one if the first things that come to mind is "is there is wiki for this?"