...famous for being the first Indian to wire a head for reservations.
This is a pun. We say we wire(=old-fashioned 'send a telegram') ahead(=in advance) for reservations for a hotel.
American Indians live on reservations (= an area of land set aside exclusively for them to live on)
a head : Nautical slang for a toilet
Put it all together - can you see the joke?
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