But in discussion I find that more people seem to know Ryu's name. Which led me to the conclusion that among Japanese people, Ryu is more well-known.
That being said, Haruki's new book almost immediately sold out of the first printing. And received enormous pre-orders. Which makes sense to me.
I have just found people more responsive when I mention Ryu Murakami.
At least critically, Ryu is more popular. Japanese critics tend to be, well, critical of Haruki.