Beyond the popular Olivia, Oliver and Owen, there aren't very many popular names that start with O. In fact, most names that start with the letter O are rather obscure.

Orion and Orlando are rather common now for boys, but many familiar female names like Ophelia or Octavia do not rank within the Top 1000 names and they haven't for decades.

Do you have any favorite O names on your shortlist? If not, you have now found a treasure trove of unique options! Just browse the list below and name with boldness knowing that your little one will have a great, uncommon name!

So tell me, which of the 25 very best O names for girls, and 25 for boys, do you like best?

Oakley                    Oceana Octavia October Odelia Odessa Odette Odile Oksana Olenna Olga Oliana Olive Olivia Olympia Ondine Opal Ophelia Oriana Oriole Orla Osanna Ottavia Ottilie Ottoline

Oakes Obadiah Oberon Ocean Octavian Octavius October Odin Odysseus Oliver Olson Omar Onyx Orion Orlando Orrin Orson Osbourne Oscar Oswald Othello Otis Otto Owen Ozzy

If O isn't your letter of choice, be sure to browse the links below to view the very best names of the other 25 letters: