Ferdinand Magellan named the Pacific Ocean in 1520 after sailing through a calm patch of water, deriving the name from a word meaning 'peaceful.'
Notes on verification
Confirmed by NOAA, History.com, and Wikipedia; minor discrepancy over exact etymological source language (Latin/Spanish/Portuguese) but core facts align. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.925 clusters=2 claim_tier=notable]
Sources
- The Pacific Ocean—facts and information (seed:science_and_space)
- https://oceanservice.noaa.gov/facts/pacific.html (corroboration)
- https://www.history.com/this-day-in-history/november-28/magellan-reaches-the-pacific (corroboration)