The Germanic words for "
Sun" have the peculiarity of
alternating between
-l- and
-n- stems,
Proto-Germanic *sunnon (Old English
sunne, Old Norse, Old Saxon and Old High German
sunna) vs. *
sōwilō or *
sōwulō (Old Norse
sól, Gothic
sauil, also Old High German forms such as
suhil). This continues a
Proto-Indo-European alternation
*suwen- vs.
*sewol- (
Avestan xᵛə̄ṇg vs.
Latin sōl, Greek
helios, Sanskrit
surya, Welsh
haul, Breton
heol, Old Irish
suil "eye"), a remnant of an archaic
heteroclitic declension pattern that remained productive only in the
Anatolian languages. The Old English name of the rune, written
sigel (pronounced ) is most often explained as a remnant of an otherwise extinct
l-stem variant of the word for "Sun" (meaning that the spelling with
g is unetymological), but alternative suggestions have been put forward, such as deriving it from Latin
sigillum (assuming that the
y is the unetymological element instead). ==Development and variants==