Sarah Moyes, from Polmont in Scotland, pleaded with Twitter users to leave her alone after the Red Devils slumped to a 3-0 defeat to local rivals Manchester City on Tuesday evening.
@moyesy wrote: "I am no relation to the football manager David Moyes. Can people please stop mentioning me in tweets, I'm pretty sure he has his own account".
Her message went viral and has since been retweeted almost 5,000 times. But, in order to cope with her newfound fame, Ravi Visvesvara Prasad - also known as @RVP - has given her a few words of advice.
He wrote: "@moyesy welcome to the mistaken identity club. You have had it really bad since man united lost to man city. My sympathies."
Then, in a surprise twist, @RVP and @moyesy began a three-way Twitter conversation with Ashley Van Buren, whose handle @AVB has also been a victim of mistaken identity.
@AVB reassured @moyesy that it would all blow over in the end, but @RVP - who became an internet hit last April after Robin van Persie scored a hat-trick against Aston Villa - had a word of warning for the young pair.
He added: "@moyesy @avb i dont think it will ever stop or blow over. I've had it really bad since aug'12. kudos to the witty humorous way you handle it".
It seems more is yet to come for @moyesy between now and the end of the season, with the Manchester United boss currently under huge pressure following a dreadful debut campaign at Old Trafford.