Asking what we're naming the baby

Jacki • Wed, Jul 20 • Our little girl is Due late August 2016 💕

So I've had a lot of people asking what we're naming the baby. Yet when I tell them I'd like to keep it semi secret till she's here they get pissed. I don't really get why anyone has any reason to be mad when I say that. Anyone else with that happening to them?