Patricia

Tris and Trissie could be nicknames.

Last year (2022), 4 baby girls were given the name Patricia in Poland. Additional 2 got it as their middle name. As of January this year, 1270 women in Poland have been named Patricia, and other 553 bear it as a middle.

The standard Polish form of this name is Patrycja, which is a reasonably common name that was popular in the 70's and 80's, but now declining in popularity. Still, last year (2021) 4 baby girls were given the name Patricia. I believe it would be pronounced the English way, which isn't in line with Polish phonetics. 3 others got Patricia as their middle name. As of January this year, there have been 1206 women in total in Poland with the first name Patricia.
A Polish Patricia could use the same nicknames as Patricia, including Pati, Patrysia, Patka, Patusia, Trysia etc. And celebrate her name day either with Patricia on August 28, or with Patrick on March 17.

Also Croatian: https://actacroatica.com/en/name/Patricia/

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Also Dutch: https://www.meertens.knaw.nl/nvb/naam/is/Patricia

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Also Romanian: https://forebears.io/forenames/patricia

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Also Swedish and Danish: https://www.nordicnames.de/wiki/Patricia

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Also French: https://meilleursprenoms.com/popularite-prenom/Patricia

Also a Bulgarian variant transliteration of Патриция. You'll find bearers on social media.

Patricia is also Swedish. The name day for Patricia in Sweden is April 16.

Also used in Slovene: https://sl.wikipedia.org/wiki/Patricia

Also used in Romania: https://ro.wikipedia.org/wiki/Patricia_Vizitiu
https://ro.wikipedia.org/wiki/Patricia_Maria_%C8%9Aig

Also Galician: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp
https://gl.wikipedia.org/wiki/Lista_de_nomes_femininos_en_galego#I

Trix and Trixie could be used as nicknames for Patricia.

Also Occitan: https://fr.wikipedia.org/wiki/Liste_des_pr%C3%A9noms_occitans (Source: Institut d'études occitanes.)

In 2018, 59 is the most common age for an American (U.S.) Patricia who is registered female with the Social Security Administration. It is the 16th most common female first name for living U.S. citizens.

The name Patricia was given to 380 girls born in the US in 2016.

When my youngest son was born 12 years ago and we named him Patrick, we were concerned that when he got older he would run into girls at school who shared the nickname "Pat" and not like it for that reason. However, it has yet to happen. In fact, he has never had a Patricia in any of his classes. It doesn't seem to get used any more. My nephew Alex, however, started going by "Al" in third grade to avoid confusion with all the girls named Alex he encountered in school.

Patricia is also the Slovak form.