Another short form for Henrietta is Hetta, as per the character Henrietta (Hetta) Silverdale, in the novel Charity Girl by Georgette Heyer.
― Anonymous User 6/28/2020
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I would add "Enrichetta" to the Italian variants. It's very rare, but not impossible. My ancient Greek teacher was named Enrichetta. Granted, she was very old. https://en.wiktionary.org/wiki/Enrichetta [noted -ed]
In 2018, 67 is the most common age for an American (U.S.) Henrietta who is registered female with the Social Security Administration. It is the 1, 324th most common female first name for living U.S. citizens.
― Anonymous User 10/8/2018
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The name Henrietta was given to 59 girls born in the US in 2015.
My mother's name was Henrietta. Unless she was signing a document, she never went by that name. Not that she didn't like it; it was just too formal-sounding. She was born on the US East coast and the common nickname at that time for Henrietta was Henet. Personally, I never liked that nickname. One of her brothers was in the habit of giving everyone nicknames, usually behind their backs. He named my mother "Penny", because of the sky-is-falling-chicken named Henny Penny. Nobody back East ever called her that, but when she moved to the West coast, everybody called her by that name. In my opinion, she was much more a Penny, than a Henrietta or Henet. Sorry for the length of this post.