Hippolytos

Folk etymology from Jacobus de Voragine's Golden Legend (mid-13th century, trans. William Caxton) entry about Saint Hippolytus of Rome:
"Hyppolitus is said of hyper, that is as much to say as upon, and litos, that is a stone, as who saith upon a stone, that is to understand, founded upon Christ. Or of in and polis, that is a city. Or Hyppolitus is as much to say as polished. He was well founded upon the stone Christ by constancy and steadfastness; he was in the city above by desire and coveting, he was polished by the bitterness of his torments."
Voragine's etymologies are, by and large, totally fabricated in order to highlight the saint's qualities, but they're fun!

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Interestingly, parts of Saint Hippolytus' legend as told by Voragine connect him with the Hippolytos of Greek mythology, notably the manner of their deaths: dragged by horses through rocks and thorns. The mythological Hippolytos was also a martyr of sorts, killed for his refusal to honour Aphrodite out of preference for Artemis, and in some versions he was deified, sometimes under the name Virbius. In contrast, the saint was, unsurprisingly, martyred for being Christian.