My iPad a sign on to a Google profile that's not mine

I was having trouble typing emails in my outlook account. The keyboard kept disappearing each time I touched a letter. So I signed out, with the intention of then signing back in but someone else's profile was there. A Outraged Surfer, with the address surfersagainstchildabuse@facefood.com. That's not a typo that's what it said, for a Google account. I don't have a Google account. What I do manages is a Facebook page called Surfers Against Child Abuse. The only other people to use my iPad are a 3 and 7 year old. Completely convinced they are not capable of setting up an email account. Any ideas how this got on my iPad. Apples response not at all reassuring that I haven't been hacked.