Edit: found it near the end of page 6! Alongside "Duck Donuts" and "London Duck Tours".
1st result: Wikipedia Duck
2nd: Wooden Ducks
3rd: BBC duck recipes
4th: Toilet duck cleaner
5th: BBC iplayer, Sarah and Duck
It goes on. The only mention of duckduckgo on the first 5 pages is this recent news
Duck doesn't mean very much in Germany, so there's little that competes with duck.com. In Britain duck has many other meanings.
If you search for an abbreviation that's commonly used as company name, you may find that Google's top result is the one near you, and that the eponymous company in Petrapavlovsk isn't listed.
1st is EN wikipedia with "Duck"
2nd is DuckDuckGo
3rd and on is several restaurants with "duck" in the name.
So it probably is location/language related to some extend.
Once more, duckduckgo.com comes up as the first result. Once more, from _Germany_. "duck" is a German word (imperative, as in "duck and cover"), but it is really rare, so I would not be surprised if the search results were biased in favor of our new fowl overlords. But I don't think it's all filter bubble, either.
a. Top stories [not organic result]
1. Wikipedia
b. Maps to "duck" restaurants [not organic]
2. Wiktionary
3. allaboutbirds.org/guide/browse/shape/Ducks
4. Merriam Webster
5. Related article from theverge.com
6. duckduckgo.com