Having grown up in the 1970's, where Steely Dan's Avant-garde approach to making music would go on to make them one of the most unique sounding groups in history, it's difficult to fathom anyone not knowing who they are. But, this is coming from someone in their 60's. Most of today's youth would probably know no more about Steely Dan then those of my generation would have known about the big bands that our parents' grew up listening to.
I'm glad that you have discovered Steely Dan's music and wish you many happy hours of listening to them in the future! 👍