vintageluvs's list "Francophile Naming Guide -- Curiousities of Medieval France for Boys" of 20 great name ideas: Odo - Sigebert!

Francophile Naming Guide -- Curiousities of Medieval France for Boys

Odo is an ancient Germanic masculine name with rich historical connections. The more modern form is the new fashionable Otto.

Most famously associated with Odo of Bayeux, the medieval bishop who commissioned the famous Bayeux Tapestry, and Saint Odo of Cluny, a significant 10th-century monastic reformer, Odo has maintained a presence throughout European history but remains uncommon in modern usage.

In contemporary culture, the name gained some recognition through the character Odo in Star Trek: Deep Space Nine. But the English word "odd" and the pronunciation of this form as odd-o make it unlikely that this form will rise along with Otto.

Osbern is a masculine name of Old English and Norse origin, derived from the elements "os" (god) and "beorn" (warrior or bear). It was introduced to England during the Viking invasions and later reinforced by the Norman Conquest. Historically, Osbern was used among Anglo-Saxon and Norman nobility, though it gradually declined in use after the medieval period. The name evolved into the more common Osborn or Osborne, often preserved as surnames. Today, Osbern remains exceptionally rare as a given name, offering a distinctive option with deep historical roots. Its meaning connects to both divine power and natural strength, appealing to parents drawn to names with significant historical and etymological substance.

Osbern

A Greek form of the rising star Otto, Othon was brought to public consciousness when a Bavarian prince named Otto became the first modern king of Greece in 1832. It was briefly popular in France in the early 20th century and might appeal today, due to its relation to Otto, and its slight similarity to Ethan and Nathan.

Othon

Most famous as the name of King Pepin the Short, this choice might feel somewhat belittling.   The even-shorter form is Pippin, a name adopted for musical theater, and the Dutch form Pepijn is in that country's Top 100.

Pepin

Perichon

Pons

Quesnac

Raimbard

The short form, Raivo, is more common these days.

Raimond

An old name still occasionally heard in the U.K., but still and perhaps forever a foreigner in the U.S.  Can be spelled Ranulf.

Ranulph

Raoul, with its unique three-vowel middle, rolls off the tongue in an appealing way. Raoul is one of the <a href="https://nameberry.com/baby-names/162/french-names">French names</a> that sounds infinitely more romantic and attractive than the somewhat harsh English version Ralph.
 French painter Raoul Dufy is a worthy artistic namesake. Raul is the Spanish form.

Raoul

Reginar

Renard

Attractive if phonetically confusing; also pronounced exactly the same as the Renault car. 

Renaud

Richer is a masculine name of Germanic and Old French origin, derived from the elements 'ric' meaning 'power' or 'ruler' and 'hari' meaning 'army.' As a personal name, it conveys strength and leadership. Historically used in medieval France and England, Richer was borne by several notable figures including Richer of Reims, a 10th-century historian. The name fell from common usage but has occasionally appeared as a surname or rare given name. Modern usage remains extremely uncommon, giving it a distinctive quality. Richer carries connotations of prosperity and abundance due to its phonetic similarity to the English word 'richer,' though this connection is coincidental rather than etymological.