I've changed my WordPress admin username to something that is cryptic, difficult to guess and never used elsewhere. However, I'm surprised that some hackers actually tried to login to my site using that username recently.
My question is, how is it possible for them to know the username in the first place? My RSS feed displays only my first and last name, not my username. Are there other places in WordPress that has unintentionally exposed my username without me being aware? Would appreciate any advice.