masc. proper name, from Latin Stephanus, from Greek Stephanos, from stephanos "crown, wreath, garland, chaplet; crown of victory," hence "victory, prize, honor, glory," properly "that which surrounds;" also used of the ring of spectators around a fight or the wall of a town, from stephein "to encircle, crown, wreathe, tie around," from PIE root *stebh- "post, stem; place firmly on, fasten" (see step (v.)).
Exclusively a monk's name in Old English, it became common after the Conquest. Saint Stephen, stoned to death, was said to be Christianity's first martyr. Stephen (and the older pronunciation of nephew, still maintained) were said to be the only cases where English -ph- isn't pronounced as /f/.
masc. proper name, German Siegfried, first element from Old High German sigu "victory," from Proto-Germanic *seges- "victory" (source also of Old Frisian si, Old Saxon sigi, Middle Dutch seghe, Dutch zege, German Sieg, Old Norse sigr, Danish seier, Gothic sigis, Old English sige "victory, success, triumph"), from PIE root *segh- "to hold" (source also of Sanskrit saha- "victory," sahate "overcomes, masters").
Second element from Old High German frithu "peace" (from suffixed form of PIE root *pri- "to love"). Siegfried Line, World War I German fortifications in France, is from German Siegfriedlinie, named for the hero in Wagner's "Ring" cycle.
"piercing that consists of a ring which goes through the urethra and out behind the glans," mid-20c., supposedly so-called from the modern legend that Albert of Saxe-Coburg-Gotha (1819-1861), prince consort of Queen Victoria, had one.
But the term seems to be not older than bodyart maven Doug Malloy and his circle, and the stories about the prince may be fantastical inventions, perhaps to explain the term. Perhaps, too, there is some connection with Albert underworld/pawnshop slang for "gold watch-chain" (1861), which probably is from the common portraits of the prince in which he is shown with a conspicuous gold watch chain. Many fashions in male dress made popular by him bore his name late 19c.