I have had that happen. "I" am in my address book with five different phone numbers. One is the cell phone, one is the home phone, one is the office work phone, another the office cell phone, one is another property I own. If someone calls from any of those phones... Then my cell phone caller ID says that I am calling myself!
It gets really confusing when I forward calls from all the other phones to my personal cell phone. People call, hear road noise and ask, I called your office number, how are you on the road?