Boy - Oliver, Oscar
Girl - Olivia, Olive
Orang-utan is a type of rainforest animal that starts with an 'o' at the start of it's name.
Orca (aka killer whale)
Omniscient, Omnipotent, Oppressive, Overwhelming, Orderly
Ostrage, Octopus, Otter, Orangutange, Owl
Oscar and Oliver are 2
O Henry
Orbit
owen
ozone
Orangutan.
Ontario
A name that starts with an "R" and ends with an "O" could be "Rico." Other possibilities include "Rocco" or "Reno."
There is no animal that has a long o at the beginning.
Oscar
Olive.
0bama
Orc