A Multiple Household Name

(My sister and her fiancé work together. He goes by his first name at work.)

Workmate: “Hi, [Sister]. How did your date with [First Name] go? Did you have fun?”

Sister: “Yes, it was great. [First Name] took me to the beach.”

Workmate: “You and [First Name] are great together.”

(They said their goodbyes and we leave.)

Mum: “Who the h*** is [First name]? What about [Second Name]? Have you changed your mind?”

Sister: *laughing* “No, Mum. [Second Name] is [First Name].”

Mum:  “Why? Is he hiding from someone?”

Sister:  “He was named after his father and grandfather. They use his second name at home to stop confusion.”

Mum:  “Okay, I understand. It would have caused confusion in our family, too, seeing as your father has the same first name.”