Heya, First off, It isn't the name of the villain in Basil the great Mouse Detective - That's Ratigan.
My Nickname cames from Rat Bag, which was boring.
When I was tichier, I learnt to speak Pig Latin (which wasn't hard, same word, first letter last and -ay on the end, eg, ymay amenay siay atiusray) this really annoyed my parents, especially when I when days speaking only Pig Latin - OK I admit - GEEK!
All that happened was my dad put a Latin twist on my existing nickname so from then I was Ratius Bagus.
I just shorten it to Ratius for my Pen name.
Hi - I'm Ratius pleased to meet you!