How can a Part get their name displayed above them?

In some models, I see on some parts, the part's name is above them, like in: Morphs Hat Removers and a lot more.

I have tried adding a Humanoid to parts, thinking there was a Head property. There wasn't. And the name didn't display when I placed the humanoid either.

And a humanoid was located as one of the children of the models.

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You are correct, you do use Humanoid to display the name. The part should be in the same model as the Humanoid and the part's name must be Head.