Also Romansh: Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars Https://sursassiala.ch/2015/01/15/familienforschung/ Https://www.portraitarchiv.ch/portrait?page=53 Http://www.annalas.ch/persunas/display/q:irma
Actually in the early 19th century Irma was most popular in France. This was due to the 1799 novel "Irma, or the Misfortunes of a Young Orphan" by Élisabeth Guénard, which was very popular in France and among French speakers for several decades after its publication. In the 1850 United States census, first listing all free residents by name, 136 of the 174 women and girls named Irma were born either in France or in French-speaking Louisiana.
Also Swedish. It briefly made the top 100 in Sweden in 2007 and 2008. Since then, between 60 and 80 girls have been given the name each year. Name day is April 7. [noted -ed]
In 2018, 53 is the most common age for an American (U.S.) Irma who is registered female with the Social Security Administration. It is the 852nd most common female first name for living U.S. citizens.
― Anonymous User 10/15/2018
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Irma or Erma could be short for names beginning with Ermin- like Ermintrude or Ermingard.