Though greatly overshadowed by the trendy Olivia, Olive has a quiet, subtle appeal of its own -- and is now enjoying a remarkable comeback. Olive is one of only four girl names starting with O on the US Top 1000. Cool couple Isla Fisher and Sacha Baron Cohen chose it for their daughter, reviving the name to stylishness, and now Drew Barrymore has a little Olive too, as has country singer Jake Owen.

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 soigne, sophisticated yet upbeat choice, unlike some of the more dated other 'ette'-ending names.

Oona is a name made famous by Eugene O'Neill's daughter, who became Charlie Chaplin's wife. One of the original Oona's granddaughters was named after her, and is now an actress famous in her own right for playing Talisa of Volantis in HBO's "Game of Thrones." The double-o beginning gives their name a lot of oomph.

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.

Octavia began as the Latin, then Victorian name for an eighth child. While there aren't many eighth children anymore, this ancient Roman name has real possibilities as a substitute for the overused Olivia; recommended for its combination of classical and musical overtones. It was chosen for his daughter by Kevin Sorbo.

Odessa, (transcribed as Odesa in Ukrainian) is a Ukrainian port city and was given its name by Catherine the Great, who was inspired by Homer's Odyssey. It would make an original and intriguing choice.

Pretty Hebrew name that would create a strong but feminine impression, as well as a variant of the Germanic name Odilia or Ottilie.

With its relation to Mount Olympus, home of the Greek gods, and to the Olympic games, this name has an athletic, goddess-like aura, making it the perfect Olivia substitute.

Olea is an unusual botanical name that relates to both olive and oil, brought to public attention when it was chosen by actress Amy Adams as the middle name for her daughter Aviana. Olea is also an occasionally used Norwegian and Danish girl's name and is said to be an Old Hebrew word for night or moon.

Olwyn is a popular Welsh name that might be an alternative to the more familiar Bronwen or Rhonwen -- though in Wales the female form is usually spelled -wen and the male one -wyn.

Ocean is a nature name that comes right out and states its meaning and association. Full of power and depth, Ocean is one of the fastest-rising baby names for both girls and boys, making the US Top 1000 for both genders in 2021. Oceane, the version that's trendy in France, was used for only 11 baby girls in the US in the same year. Ocean-lovers who want to be less obvious can choose such subtler names that mean ocean as Jennifer or Marissa, but coming right out and using Ocean is a perfectly valid way to go.

Mount Olivet is a mountain ridge east of and adjacent to Jerusalem's Old City. It is named for the olive groves that once covered its slopes. Several key events in the life of Jesus, as related in the Gospels, took place on the Mount of Olives, and in the Acts of the Apostles it is described as the place from which Jesus ascended to heaven. This name makes a fresh alternative to Olivia and is worthy of consideration.

Oaklyn is one of the oak-related names moving up the popularity charts, along with more popular sister Oakley and near-identical twin Oaklynn. The Oaklynn spelling used for three times as many baby girls as Oaklyn -- 1800 vs. 600.

Though this name properly takes an accent over the first e, most Americans would probably have trouble pronouncing it with French elan.

Variant form of Olena. George R. R. Martin used this spelling for a character in his "A Song of Ice and Fire" series. It is likely inspired by the Ukrainian form of Helen meaning "torch; shining light".

Sounds a lot like the recently revived Adele.

Odalys has two possible origins, one perhaps more likely — and more favorable — than the other, given that is used predominantly in Spanish speaking countries. Most familiar in Cuba, Puerto Rico, Venezuela, Spain, the Dominican Republic, and the US, it can also be spelled as Odalis.