Had something similar happen to me... story time, here we go, lucky you.
Had a friendly female customer sign the diad. She told me her last name and as i was walking back i kind of half forgot it, but i remembered it started with "S,T" and ended in "ART" or something. So i randomly mashed in a bunch of letters inbetween.
Few days later, the bid driver comes up to me and asked, "At the vet, clinic why did you type in STDWART? She isnt going to call it in, but is bothered by what you wrote."
Was it my subconsciouss typing that? it was completely by chance though. Anyways, the next few days i delivered there were beyond awkward. I should have talked to her but she wouldnt have believed it was an accident. it sucked because she was real nice too.