My quess is Log Cabin too.

I kinda doubt that most log cabin quilts were made using a purchased pattern so "best selling" wouldn't apply to them. Purchased quilt patterns are a relatively new concept.

I would say Log Cabin or Grandmothers Flower Garden

logcabin elnore burns my first quilt suzieQ

The question was for best SELLING - - -

I have no idea how to find that out - and for how far back?

Yes, I have to agree with the Log Cabin, as that is one of the very oldest patterns there are. Well documented in the early 1800's, and before that!!

The quilt guild I am in thought it might be the Yellow Brick Road.

I remember reading somewhere in the 1990's that Eleanor Burns Log Cabin book was the best selling quilting book of all time. Not sure where I read it and it's been a while but I think she revolutionized modern quilting with that book.

I think in the past few years, "Yellow Brick Road" is one of the most popular.

I would guess Ohio Star is way up there too.