The story
- Proto-Germanic*sīhwaną
- Proto-Germanic*saiwiz
- Old Norsesær
- Old Swedishsiœr
- Swedishsjö
- Proto-Germanic*bergaz
- Old Norseberg, bjarg
- Swedishberg
- SwedishSjöberg
- EnglishSeaborg
- Englishseaborgium
- English todayseaborgate
From seaborgium + -ate (derivative).
Etymology from Wiktionary, CC BY-SA 4.0.