- "And Odo the hero, they bore him back home
To the place that he'd known as a lad,
They laid him to rest with his hat inside out
And his wand snapped in two, which was sad." - — Part of a song about Odo
Odo is a relatively unknown character, but he has been mentioned in songs twice. The first time was in 1996, Hagrid and Professor Slughorn were drunk right after Aragog's funeral and it was about him dying. The second was at Bill Weasley and Fleur Delacour's wedding where Hagrid, Charlie Weasley, and a "squat wizard in a purple porkpie hat" were singing "Odo the Hero". Odo could have possibly been a friend of Hagrid's since Hagrid was around in both situations or it could just a drinking song of sorts.
Etymology
Odo is a name typically associated with historical figures from the Middle Ages and before, most especially Count Odo, who led an unsuccessful defence of Paris against the Vikings in 885. Odo is etymologically related to various European names which all come from a Germanic word meaning "possessor of wealth".