Not a criticism but I'm actually very curious. Why do people care about what names go with other names? As in "my son is called John, what shall we call his brother?"
It doesn't happen in my country so it has never occurred to me that there needs to be any correlation between sibling's names. I rarely speak to my sister, and I'm sure if family speak about us, they just say our names without further thought.
What's the reason behind this custom?