I think Jell-O has been the catch-all term for fruit flavored gelitan products.

The official product name is Lego Bricks, but just about everyone seems to call them Legos. Even if they're a knockoff brand.

Kool-aid is so commonly used, "Drinking the Kool-aid" was used to refer to the Jonestown incident. Even though they used "Flavor-aid" the name.

The internet age also brought in the terms "Google it" and "Photoshopped".