Odo's full name is Odo'ital, meaning "nothing," given by Bajoran scientists and a Cardassian overseer. Odo dropped the surname "Ital" after finding meaning and identity through friendships on Deep Space Nine. The story of Odo's name is revealed to the Female Changeling, not Kira, in "Heart of Stone."

It's not mentioned often, but Star Trek: Deep Space Nine's Constable Odo (Rene Auberjonois) actually had a full name that he chose not to use. Discovered in his liquid state in orbit above Bajor, Odo spent a large part of his life before DS9 enduring a battery of painful laboratory tests. The experiments were conducted by Bajoran scientist Dr. Mora Pol, played by James Sloyan, who was unaware that Odo was a sentient being. When Odo eventually signaled his sentience to Pol, the two worked together so that the Changeling could maintain a solid form.

After Odo and Mora Pol parted,...