Gretha is a unique and distinctive given name, originating from German and Dutch roots. It's a feminine variation of the masculine name Gregor, which means 'vigilant' or 'watchful'. In some cultures, Gretha may also be associated with strength and wisdom, reflecting its derivation from the Old Germanic word 'grētan', meaning 'to weep'. However, it's important to note that this name is not widely recognized in English-speaking countries, giving those who bear it a certain uniqueness. Historically, the name has been more prevalent in Germany, the Netherlands, and Scandinavia.
"Gretha saw its highest popularity in the late 1920s and early 1930s, with peaks of 8 births in 1928 and consistently 5 or more births from 1931 to 1935. After a significant decline, it resurged slightly in 1947 and again much later in 1966, but overall its popularity has been relatively low throughout the century."