Õie means “flower.” In Estonian, Õ is its own separate letter, not just an O with a tilde.
Oktjabrina is borrowed from the Russian name Oktyabrina, which was most popular in the early decades of the the USSR. It means “October.”
Oksana is borrowed from Ukrainian. It’s a form of Xenia (hospitality). In 2019, it was Estonia’s 74th most popular female name.
Olesja is borrowed from the Ukrainian name Olesya, which is a diminutive of Oleksandra (defending humanity). This name is fairly popular in Estonia.
Õnne means “happiness; luck.” The longer form is Õnnela. The male Finnish form is Onni.
Õnneleid means “good luck.”
Odart is an archaic name borrowed from Old High German and Old Saxon, meaning “strong riches/wealth.”
Oleg is adopted from Russian, and ultimately derives from Old Norse name Helgi (blessed; holy). In 2018, this was Estonia’s 15th most popular male name.
Õnnepäev means “day of luck.”
Oskar is borrowed from German and the Scandinavian languages. It may mean “deer friend” or “God’s spear.”
Osvald is borrowed from the Scandinavian languages, and means “God’s power.”
Ott may be an Estonian form of Otto (fortune; wealth), or taken from an Old Estonian word meaning “bear.”