- Baron Nils A·dolf E·rik [nils ah-dawlf ey–rik] /nɪls ˈɑ dɔlf ˈeɪ rɪk/, 1832–1901, Swedish arctic explorer, geographer, and geologist; born in Finland.
- his nephewNils Ot·to Gus·taf [nils awt-too goo s-tahv] /nɪls ˈɔt tʊ ˈgʊs tɑv/, 1869–1928, Swedish arctic and antarctic explorer.
- Baron Nils Adolf Erik (nils ˈɑːdɔlf ˈeːrik). 1832–1901, Swedish Arctic explorer and geologist, born in Finland. He was the first to navigate the Northeast Passage (1878–79)