Luxembourgish Princes

Charles derives from the Germanic name Karl, meaning "man" or "free man", and is a royal name in multiple European countries. A famous early bearer is Charlemagne, King of the Franks and Lombards and then Roman Emperor in the 8th-9th centuries.

Felix is one of those ancient but nontraditional names for boys that have come into favor over the past few decades, a favorite of parents who want a masculine name with history and heft that breaks ranks with the standard Franks and Freds. Felix is also an international darling, ranking in the Top 100 in several European and English-speaking countries.

Franz is the German equivalent to Francis, and you'll be hard-pressed to find a Franz outside of countries with Germanic origins. In America the name is often associated with celebrated author Franz Kafka, who was born in Prague.

One of the most familiar German names, with an upright Prussian image. Friedrich might just have been out for long enough to start coming back in.

An everyday name in France, a charismatic possibility here.

The chic Euro spelling of Henry is rising along with the original form.

In Paris, it's charming, but in America, it's still Jean, as in blue jean. Or Aunt Jean.

Kate and William shocked the world when they announced that they'd named their third child Louis -- Prince Louis Arthur Charles, to be more precise. But we've been predicting a comeback for this classic name for a long time.

William is one of the most enduring of classic names for boys. It's also among the most popular boys' names, as American parents see it as being ideally conservative yet contemporary, and hands-down the most popular baby name beginning with W of all time.