Apple mail: account name overwritten by "John Appleseed"

[outsidein]

Hi,

since yesterday I observe some strange thinks happen with my mail account settings on iPhone and Mac. My name was overwritten by "John Appleseed". This name has some relation to apple, I'm wondering if this is a kind of hidden easter egg or default, or indication of malware.

[k310]

It's the pre-stuffed email address in Contacts, for as long as my memory goes back.

Why it's flipping is another matter, like the auto-suggestion of an email address I haven't used in a year, or the URL that I never ever typed being suggested in the browser.

I'm open to suggestions on how to get rid of such phantoms, without killing auto-fill suggestions entirely.