Name
- John XXI, Pope, d 12771
- John, Saint, Apostle and Evangelist1
- Johnson, Robert, composer1
- Josequet?, magister1
- Jude, Saint, Apostle1
- Jónsdóttir, Astriðr, widow of Magnús Jónsson of Vígr1
- Jónsdóttir, Steinunn1
- Jónsdóttir, Valgerdr, wife of _ordr Oddsson, Priest of Völlr, South Iceland1
- Jónsson, Finnr, Bishopof Skálholt, d 17891
- Jónsson, Gisli1
- Jónsson, Gudbrandr, Pastor of Vatnsfjördr, west Iceland1
- Jónsson, Jón1
- Jónsson, Karl, Abbot of Thingeyrar, north Iceland; d. circ 12131
- Jónsson, Sigurðr, Priest of Presthólar, north Iceland, d 16611
- Jónsson, Steinn, Bishop of Hólar 17111
- Jónsson, Thorsteirn1
- Jónsson, Thórdr1
- Kálfsson, Lárentíus, Bishop of Hólar, d 13301
- Magnus I, of Norway1
- Magnusson, Ari, chief magistrate of Isafjördr in Iceland1