Celeb names aren't evidence.
North, as a name, would make me expect four siblings, of either gender since the compass is gender-neutral, with the others named South, East and West. But I'd be equally ready for the first three - North, South and East - to be the same gender, and then the sequence would be broken and the sibset would be North, South, East and
Jacqueline. Or North, South, East and
Jedidiah.