would you be talking about it if the name was something else? Brand is a BIG part of any new search engine, one portion of it is remembering the name -- kinda hard to forget one with the name DuckDuckGo.
No, it's easy to remember, if you remember the childrens' game "Duck Duck Goose." If you don't know the game, then yeah, the URL is just pretty nonsensical.
I also was thinking, "This should be a kids site". I like the idea of a search engine for kids. You could concentrate on indexing only "kid safe" and "kid related" content. What a perfect name for that.
As for the length of a name, and if it "verbifies" easily, these are things I agonize about a lot. Perhaps we're taking too much upon ourselves. The users will find a way to talk about it easily, if they need to talk about it at all. "America Online" -> AOL, "Treasury Inflation Protected Securities" -> TIPS, "The Federal National Mortgage Association" -> Fannie Mae, etc.
I somewhat agree with you. In the long-run in my opinion it will hinder widespread adoption because, as you said, the name just sounds silly. But right now the name probably helps them because it generates attention and is memorable. But how DuckDuckGo thinks about this when it comes to a long-term perspective I don't know.