Tobias is a fictional character and one of the six protagonists of K. A. Applegate's Animorphs series. His surname is never mentioned, but had the Ellimist not altered time in order to take his father, Elfangor-Sirinial-Shamtul, back to his old life, his full name would have been Tobias Fangor, the family name adopted by Elfangor when he assumed a human identity on Earth.

The above text is a snippet from Wikipedia: Tobias (Animorphs)
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