msoccer04's list "O Names" of 4 great name ideas: Opal - Ogin!

O Names

Opal is on the verge of a repolishing, following other jewel names like Ruby and Pearl. A Top 100 name during the first two decades of the twentieth century, the opalescent Opal has a good chance of coming back as another O-initial option.
 The ancient Greeks believed that opals were formed from the tears of joy wept by Zeus when he defeated the titans, and that the opal bestowed prophetic powers; the Romans considered it a symbol of hope and good fortune. It was a favorite gem of Queen Victoria.
 Opal Pelis is a character in Theodore Dreiser's seminal 1925 novel An American Tragedy.
 And keeping with the O theme, Opal is the birthstone of October, making it an appropriate choice for a little girl born in that month.

Opal

Odette is the good swan in Tchaikovsky's ballet Swan Lake, a role for which Natalie Portman won an Oscar ---and it would make a particularly sophisticated yet upbeat choice. In fact, it charted in the US charts in 2025 for the first time since 1905!
 
Also popular in Belgium where it ranked in the Top 100 in a recent year, Odette is a diminutive of Odilia or Oda, which are in turn relatives of Otto, meaning "wealthy". With the stylish appeal of Ottilie and the renewed interest in Otto itself, perhaps it shouldn't be surprising that this one has made the charts. 
 The name first became publicized during World War II via the courageous French Resistance heroine Odette Brailly, who risked her life to supply information to the Allies. She was captured by the Germans, and wrote her story which was retold in an eponymous film.
 
Other Odettes include Odette de Crecy, the flamboyant wife of Charles Swann in Proust's A la Recherche du Temps Perdu, and the daughters of actor Mark Ruffalo and Sunrise Coigney, Nikki and Isaac Hanson, and Jared and Genevieve Padalecki.
 Variant Odetta is associated with the folksinger who was one of the first to go by a single name.
 
Pronounced as AW-DEHT in French, O-deht and OH-deht might be heard elsewhere. Nicknames could include Odie, Etta, Dodie, and Dot.

Odette

Predominantly used on boys, Omari is occasionally used on girls in the US, while in Nigeria, it is considered mostly feminine. It is considered a Swahili form of the Arabic names Omar and Umar.

O Names

The names

Opal

Odette

Omari

Ogin