Old
Norse names often form diminutives (pet names) based on one element
vDiminutives are formed
from compound names most often by a sort of contraction and by changing a strong declension into a weak (usually in the second
element, but sometimes in the first element of the name), or by adding -si, -ka, or the like.
Our best evidence for diminutives comes from runic inscriptions, as the sagas only rarely mention them.
vFeminine: Sigga from Sigríðr; Gunna from Guðrún; Inga from
Ingunu; Imba from Ingibjorg; Gudda from Guðríðr; Manga from Margrot; Valka from Valgerðr; Ranka
from Ragneiðr and Ragnhildr; Jóka from Johanna; Tobba from Þórbjörg; Sissa from Sigþrúðr; Kata
(Engl. Kate) from Katrín; Kitta from Kristin; Asta from Ástríðr; þura from Þuríðr; Dura from Halldóra,
etc.; Disa from Valdís, Vigdís, Herdís, etc.; Geira from Geirlaug; Fríða from Names in Frið- or -fríðr, etc.;
Þrúða from Jarþrúðr, Sigþrúðr; Lauga from Guðlaug; Asa from Aslaug.
vMasculine: Siggi from Sigurðr; Gvendr from Guðmundr; Simbi from
Signumdr; Brynki from Brynjólfr; Steinki
from Steingrimr; Mangi from Magnus; Runki from Runólfr; Sveinki from Sveinn;
Sebbi from Sigbjörn,Sveinbjörn
(rare); Erli from Erlindr (Erlingr); Gutti from Guþormr,or rarely Guðbrandr;
Kobbi from Jakob; Valdi from
Þórvaldr; Mundi or Asi from Asmundr, etc.; Láki from Þórlákr; Leifi from
Þórleifr; Láfi from Öláfr; Eyvi
from Eyjólfr; Keli from Þórkell; Laugi from Gunnlaugr; Tumi (Engl.
Tommy") from Thomas
occurs in Icelandic as an independent name about the middle of the 12th century, and was probably borrowed from the English; Fúsi from Vigfús;
Grimsi from Grímr; Jonsi from Jón (English Johnny); Björsi from Björn; Bensi from Benedikt.
Diminutives
appear to have moved into name stocks as personal names over time
vMany Viking Age personal
names with a weak declension in -i were probably originally diminutives, e.g. Bjarni from Bjorn; Arni (Arne) from Örn; Bersi from
Björn; Karli (Engl. Charley) from Karl; Jóra from Jóreiðr; Ragna from compounds in Ragn-,
Ragneiðr; Ingi and Inga from compounds in Ing-; Goddi was probably
from compounds in Goð- (Guðmundr) as the present Gudda of girls; Boddi (a name
of the 8th century)
from those in Böð- (A. S. Beadu); Daði (occurs in an Icelandic colonist
family from the British Isles
in the 10th century) probably from Davíð (Davy); Sebbi
and Ubbi occur on Swedish Runic stones; Helgi (old form Hölgi) from Haleygr.