I myself have a thing for the rose, specifically the white, black, and red roses. I know there is a lot of material about the meaning of roses and their color, but in a nutshell, for me the rose represents (in no particular order): love, honour, purity, innocence, death, life, rebirth, temptation, pleasure, and pain.
When I was thinking up the name, for some reason Ebon just sounded more romantic than Black and it does go back to the Middle English as being of a black color. Having a fondness for the romantic ideals of chivalry, knights, and codes of honour and wanting something that paid homage to that and with the idea that Steff was looking back to Gallente's past for inspiration, I settled on Ebon and the title sounded right after saying it a few times.
Now, a confession of sorts...another reason I didn't go with the Order of the Black Rose is because of one of my favorite fantasy villains of all time: Lord Soth, Knight of the Black Rose.
On a side note...I should have paid a bit closer attention to the Ticker field in the Corp setup instead of just selecting the default. I'd blame the lack of description on what the field is used for, but even then, I should have caught it before moving on cause now I'm the owner of OOTER