Ethel

Ettie, Etta, Ellie and Ella could be nicknames.

Also Estonian: https://www.stat.ee/public/apps/nimed/

In 2018, 84 is the most common age for an American (U.S.) Ethel who is registered female with the Social Security Administration. It is the 505th most common female first name for living U.S. citizens.

Ethel was given to 12 girls in America in 2015.

Sounds as dated today as such elaborations as Ethelburga ("noble fortress" in Anglo-Saxon) and Ethelinda ("noble serpent"), as well as the male name Ethelbert. Although Ethel is an old lady's name today, it was a middle-aged woman's name in the 1950s and a young girl's name in the 1900s. Despite also being a rare male name when it made the boys' top 1,000 in the United States in the 1900s, it is virtually unknown in that role today. Practically everyone does not see this name as unisex, but feminine only.

In the United States and in the first decade of the 20th century, this was both a popular girl's name and a very rarely used boy's name, yet the majority only know it as a granny name, for it dropped out of the boys' top 1,000 around 1910. The girl's name, at the time, was also occasionally spelt 'Ethyl' - a variant spelling rather than a borrowing of the word 'ethyl' (also pronounced 'eeth-ill'), indicating a type of alcohol.