DuckDuckGo has the disadvantage of not only sounding silly, but also being composed of silly-sounding real words. And not having a secret geeky meaning that people find out about and then feel like they're part of an elite club.
It was, simply put, the biggest named number anyone knew and was frequently used as such in arguments... e.g. I watched that movie 1000 times! Oh ya? Well I watched it a google times.
Same here, as someone who was in high school in the late 90s and switched from AskJeeves/Yahoo/Altavista to Google around ~2000, part of the appeal was "Somebody named a search engine after the biggest number meme we know? AND it's fast? AND it gives good results? Lemme check this out..."
// did that get auto-corrected? if so, ironic, as it’s said "Google" was an accidental misspelling of "googol" by Sean Anderson back in ‘97…