- John,1803–89, Swedish engineer and inventor; in the U.S. after 1839.
- Ericson, Leif.
- Leif [leef; Icelandic leyv] /lif; Icelandic leɪv/, flourished a.d. c1000, Norse mariner: according to Icelandic saga, discoverer of Vinland (son of Eric the Red).
- Leif (liːf). 10th–11th centuries ad, Norse navigator, who discovered Vinland (?1000), variously identified as the coast of New England, Labrador, or Newfoundland; son of Eric the Red