I know a farming family, South African, one partner of Scottish descent, the other bilingual English-Afrikaans. They married in the 1930s and, family tradition says, were reading a farming magazine together when they found an article suggesting names for future children. As yet, they had none: they looked down the list and found that they both liked
Brian,
Graham and
Ian. In due course, they gave those names, in that order, to their three sons. They didn't have a daughter; the name she would have got was Zilda! I've never seen it before, and it's not clear if it was on the list or not.