Since that word is an eponym (a common noun made from a proper noun), the first mentor was clearly Mentor, the mentor of Telemachus.
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the first mathmatician is the first to count he was caveman
Adam was the first first name and Katz (pronounced: cats) is the first Jewish name.
It's a first world country
the first people who came to Canada is the first nations or you can call them aboriginals.
100 first about the Philippines