According to cian, a member of other Tolkien message boards:
Sauron is Quenya though: archaic *Thaurondo > *Thaurond > *Thauron > Sauron.
Saruman is from Old English (David Salo suggests West Saxon) meaning 'Man of skill'.
Old English searo (searu) 'art, skill, cleverness, cunning' (of interest searocræft 'artifice, treachery, wile')
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