Caracala

Since caracala gave them citizenship, and his name was marcus aurelius antoninus, everyone who gained citizenship from him took the name. So we have records of soldiers in the two tens, and before every name th now is marcus a Aurelius. They've all got those names, and it's like they just appended that beginning of whatever names they had originally. And so many people would have been affected by this as well, that odds are if you find at marcus a is a result of this.