It's kind of cute, but why is it doing this and how can I change it?
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iOS shows the folder name when you search for an app that's stored within a folder as opposed to lying on the springboard main screens.
Any chance someone punked you by making a clever named folder and placing these exact apps inside that folder?
You can be sure your phone is fine by making a folder and controlling which apps are stored in that folder as well as the name of that folder. Searching for those apps should show the folder name of your choosing.