Inga

Strictly feminine form of INGE.

INGE   female & male   Danish, Norwegian, Swedish, German, Dutch
Short form of Scandinavian and German names beginning with the element ing, which refers to the Germanic god ING. In Sweden and Norway this is primarily a masculine name, elsewhere it is usually feminine.
ING   male   Germanic Mythology
From the Germanic *Ingwaz, possibly meaning "ancestor". This was the name of an obscure old Germanic fertility god who was considered the ancestor of the tribe the Ingaevones. It is possible he was an earlier incarnation of the god Freyr.
FULL FORMS
ANCIENT GERMANIC: Ingeburg
ANCIENT SCANDINAVIAN: Ingibjörg, Ingigerðr, Ingríðr
DANISH: Ingebjørg, Ingeborg, Ingegerd, Inger, Ingrid
GERMAN: Ingrid
ICELANDIC: Ingibjörg
NORWEGIAN: Ingebjørg, Ingeborg, Ingegerd, Inger, Ingrid
SWEDISH: Ingeborg, Ingegärd, Ingegerd, Inger, Ingrid
EQUIVALENTS
ANCIENT GERMANIC: Inga
ANCIENT SCANDINAVIAN: Inga
DANISH: Inga, Inge
DUTCH: Inge
FINNISH: Inka, Inkeri
FRISIAN: Inka
GERMAN: Inga
ICELANDIC: Inga
LATVIAN: Inga
LITHUANIAN: Inga
NORWEGIAN: Inga
RUSSIAN: Inga
SWEDISH: Inga
OTHER FORMS
GERMANIC MYTHOLOGY: Ing