This is a purple sand porcelain seal. May I ask what the words inside are?

Short answer "Yixing purple sand"

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The explanation is the four characters "Yixing Zisha", not a person's name. These four characters are in small seal script. The pictures above are all upside down and relatively blurry. Turn the picture upside down and trace the words to see clearly:

Click "right up and down, left up and down" to read.

Dictionary Online Calligraphy Dictionary----Yixing Zisha: