Meaning of name Ireland

The names of some famous persons by the name Ireland (or its variants) are:

Irene Castle, born on 17 April, a famous dancer. Irene Castle's background: Famous ballroom dancer. She was part of a husband-wife team on the dancefloor, with husband Vernon Castle. They became famous in Paris first, where they introduced American ragtime dances, such as the Turkey Trot. Subsequently their fame spread far and wide, especially in the U.S., where they opened a dancing school.