My friend (genuinely, this not a 'friend nudge nudge') is in the late stages of pregnancy.
She has been with her partner for five years.
In the early stages of their relationship he emotionally cheated for several months but they've moved on etc etc. It's obviously still a sore subject so never brought up.
Anyway they were talking baby names and he suggested the surname of the person he cheated with as baby's first name 
He did it without thinking but she's annoyed at his thoughtlessness.
It's s she being unreasonable? Lol