I'm pretty sure the dwarf who became my first mayor was operating under an assumed name. He was known to the fortress as Itlud Curllocks, and had no non-combat skills.
I really like making intricate tombs for my most important dwarves, and so I've got a hall set up to hold the remains of the mayors of my fortress. Whenever a new mayor is elected, they get a tomb and a statue in it.
For a while, I was confused why I couldn't make statues of this mayor, as all the statues I made of him were of some dwarf named Zon Granitetalk. Specifically of Zon Granitetalk being elected mayor of my fortress. At first I was confused, and thought that I'd had another mayor that I hadn't noticed, but I didn't see any record of a Zon Granitetalk anywhere in my fortress, living or dead.
Finally, I thought that perhaps Itlud Curllocks was Zon Granitetalk, so I just put the statues in his tomb.
A few years later, Itlud had joined the military, and was sent in to deal with a forgotten beast who had gotten into the fortress because I hadn't yet properly secured the cavern entrance. My elite marksdwarf had been dodging and shooting the beast repeatedly when Itlud came charging in with his hammer, and pretty much immediately got brutally murdered by it. Eventually the rest of my military showed up and killed the beast.
So now his tomb reads that it is the final resting place of Itlud, but when I examine it it contains the head and partial skeleton of Zon Granitetalk.