Id check a bit deeper in your Google contacts to make sure they aren't in there. If you're a member of Google+, perhaps it's people in your Circles. Could come from any number of sources.
I recommend locating the cause of the issue and ruling out rogue apps before disabling the option in Google Now. It could be a nasty app, and you don't want to hide it by disabling the feature without searching for the cause first.
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