Definition from Wiktionary, the free dictionary
-  Danskernes Navne, based on CPR data: 37 237 females with the given name Grethe (compared to 10 098 named Grete) have been registered in Denmark between about 1890 (=the population alive in 1967) and January 2005, with the frequency peak in the 1930s. Accessed on 19 May 2011.
Grethe ? (genitive Grethes)
- A female given name.
- Kristoffer Kruken - Ola Stemshaug: Norsk personnamnleksikon, Det Norske Samlaget, Oslo 1995, ISBN 82-521-4483-7
-  Statistisk sentralbyrå, Namnestatistikk: 9940 females with the given name Grethe (compared to 9448 named Grete) living in Norway on January 1st 2011, with the frequency peak in the 1940s. Accessed on April 18th, 2011.