Erin

Also a Welsh name.

Erin is also Finnish. The name day for Erin in Finland is November 7.

Also Finnish name. Finnish name day November 7.
https://fi.wikipedia.org/wiki/Erin
https://almanakka.helsinki.fi/en/name-days/name-day-search.html

In 2018, 27 is the most common age for an American (U.S.) Erin who is registered female with the Social Security Administration. It is the 168th most common female first name for living U.S. citizens.

The name Erin was given to 58 boys born in the US in 2015.

Erin is actually a unisex name, though more rarely used in a male's name than a female's.

In 2004, Erin was indeed among the top 100 names given girls in Ireland. However, like Colleen, the idea of first turning Erin into a girls' given name began outside of Ireland with Irish-Americans and Irish-Australians, and it was only then exported back to Ireland as a name from overseas. So originally it wasn't an "Irish" name in the sense of first being used as a given name in Ireland.

Can also be a masculine name.

I am probably one of an extremely limited few named Erin between 1940-1949. In Junior High School I was assigned to the boy's gym class because some office worker inserted a v making my name Ervin. I was also allowed to stay only two days in mechanical drawing class when the teacher realized I was a "girl".

Name books always say that it´s not used as a name in Ireland at all, but as far as I know it´s in the Irish Top 100.