I Googled as you suggest and I did not find anything by a former submarine officer staying at the Royal Hawaiian Hotel who went on to discovered when old married couples have only girls. Could you give something more specific or a link?
An old wives tale was “Lots of baby girls, there will be peace. Lots of baby boys, there will be war”
I can’t find anything either. I’d love to know more. My husband has 4 sisters.