In 2018, 38 is the most common age for an American (U.S.) Heidi who is registered female with the Social Security Administration. It is the 399th most common female first name for living U.S. citizens.
― Anonymous User 10/17/2018
3
I don't know why this site says this name is Dutch. I'm Dutch and I've never met anyone named Heidi. It's seen as a very German name where I live. [noted -ed]