Sandra

Also Estonian: https://www.stat.ee/nimed/Sandra

I think it could be short for Cassandra or any other name that ends in -andra.

Also Finnish name. Finnish name day September 11.
https://fi.wikipedia.org/wiki/Sandra
https://almanakka.helsinki.fi/en/name-days/name-day-search.html

Also Catalan.

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Catalan Pronunciation: SAHN-drə.

Also used in Estonia: https://et.wikipedia.org/wiki/Sandra_(eesnimi)

Can be a nickname for Cassandra.

This name can also be a diminutive of Cassandra.

In 2018, 63 is the most common age for an American (U.S.) Sandra who is registered female with the Social Security Administration. It is the 45th most common female first name for living U.S. citizens.

A Finnish female name.

Sandra is also a Polish name. As for now I guess it's used more often as a name on its own than a diminutive of Aleksandra, because the most common nickname that almost every single Aleksandra goes by is Ola. Sandra became popular sometime between 70s-80s and is still fairly popular. It can be of course also a diminutive of Kasandra, but Kasandra isn't particularly popular. Sandra can be nicknamed to Sandi, Sandrusia or Sandrunia for instance. Pronounced SAHND-rah.

The name Sandra was given to 318 girls born in the US in 2016.
More than 99.9 percent of people with the first name Sandra are female.

The name is also used in Iceland. [noted -ed]

My mom's name is Sandra. She was born in Colombia. I don't know how my grandmother thought of naming her since Sandra isn't really a Spanish name. People call her Sandy sometimes.

Popular in Serbia. [noted -ed]

Sandra is also a popular name in Croatia.

Also used in Romania, pronounced SAHN-drah.

This is also Scandinavian. [noted -ed]

Sandra is a very popular name in Portugal.

Also used in Portuguese, pronounced SUN-dra. I've got a cousin with this name.
[noted -ed]

Also used in Lithuania. [noted -ed]

Also used on girls in Slovenia. [noted -ed]

Sandra is more popular in the Czech Republic. Is in Top 100. A famous bearer is German singer Sandra Nasic (Guano Apes).

Sandra is a popular name in Germany. [noted -ed]

In Spain it is not only used, but very common for some decades, as a diminutive of Alejandra or as a name itself.

It flourished in the USA between the last 50s and the first 60s due to actress Sandra Dee (b. 1942). Among others, Sandra's usage is also Czech, Polish and Swedish. In Hungarian it is written Szandra.