[kerkeslager]

The past tense of DuckDuckGo is DuckDuckWent, as in "I DuckDuckWent my name and discovered my high school yearbook has been digitized."

[Fnoord]

Except it is rather like you exclaim "Duck Duck Go!" to a duck who then executes your command. A past sense would be that you exclaimed "Duck Duck Go!". Turning it into DDGing makes more sense, as already suggested.

[puranjay]

I'd prefer "I DDGed my name"

[KingMachiavelli]

Am I the only one that using 'quack'/'quacked' as my verbs for using DDG?