I do have a male cousin (distant cousin) in my family tree who was called Regina. He was given the second name of John. I expect he went by Reg or Reggie; when he married his name was given as Reginald.
Regina is also Croatian and Slovak. The name days for Regina in Croatia are August 22 and September 7. The name day for Regina in Slovakia is September 5. [noted -ed]
In 2018, 46 is the most common age for an American (U.S.) Regina who is registered female with the Social Security Administration. It is the 353rd most common female first name for living U.S. citizens.
― Anonymous User 10/15/2018
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The nickname for Regina is Gina or Ginny. The nickname for Reginald is Reggie.
-https://en.m.wikipedia.org/wiki/Regina_Todorenko
-https://en.m.wikipedia.org/wiki/Regina_Dubovitskaya
-https://en.m.wikipedia.org/wiki/Regina_Zbarskaya
-https://ru.m.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D0%B8%D0%BD%D0%B0_(%D0%B8%D0%BC%D1%8F) claims its Russian and Ukrainian
-https://allskaters.info/regina_gorokhova/
-https://allskaters.info/regina_belyaeva/
-https://allskaters.info/regina_koroleva/
You can also find many Russian Reginas on social media. [noted -ed]