Carolyn

The standard Polish form of this name is Karolina, although Carolyn has also been used a little bit in Poland. In January 2020, there were 45 women with the first name Carolyn in the whole Polish population, so the name was #1824 in the ranking. There were also 19 women with the middle name Carolyn (#1511). Caroline is also used a little. Carolyn could celebrate her name day with Karolina (9th May, 5th July, 18th July, 18th November) or Karol (4th June, 4th November).

In 2018, 63 is the most common age for an American (U.S.) Carolyn who is registered female with the Social Security Administration. It is the 102nd most common female first name for living U.S. citizens.

The name Carolyn was given to 349 girls born in the US in 2016.
More than 99.9 percent of people with the first name Carolyn are female.

It's also German. It means "Song of Joy".

I know for certain that Carolyn is not a modern variant of the name. My grandma's name is Carolyn, and she's in her 70's, meaning that, although this name is a variant of Caroline, it is definitely not a modern one.