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In 2006 in an online chat with Hey Arnold! fans, Bartlett revealed that Arnold's grandpa used his last name throughout the series, almost confirming that Arnold's last name is "Shortman".

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7y ago
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7y ago

Arnold Phillip Shortman

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7y ago

Shortman

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6y ago

Shortman.

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Q: What was Arnold's last name on Hey Arnold?
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