Irene

From the experts:

Serene Irene, the name of the Greek goddess of peace, was hugely popular in ancient Rome and again in the United States a hundred years ago.

One of the most popular names of the Roman Empire and the name of several early saints, this originally Greek name (then spelled Eirene) represented a daughter of Zeus who was the goddess of peace. Often pronounced with three syllables, it spread throughout Europe in a range of variations and is a royal name in Greece, Denmark, and the Netherlands.

Much of Irene's popularity in England stemmed from the character Irene Forsyte in Galsworthy's The Forsyte Saga (pronounced eye-reen-ee). Americans identified it with the sparkling Irene Dunne of Hollywood's Golden Age. Irene was a Top 20 name from 1915 to 1925, remaining in the Top 100 until 1945. It still highly popular in Spain.

Some other references include the eponymous early smash hit Broadway musical, famed ballroom dancer Irene Castle (portrayed on film by Ginger Rogers), the Hollywood costume designer known simply as Irene, the Uma Thurman character in Gattaca, Irene Denholm the Harry Potter student at Hogwarts School, and the lullaby-ready song Goodnight, Irene.