Who else has gone through this

Ok so I recently shared the names I have in mind In case my husband and I end up having a baby girl with my sister inlaw only in pretty cool with her all the time but with this pregnancy sometimes her comments or conversation piss me of and after I shared my names with her she started looking for names she likes and telling us you should name her this and that is gonna be my lil baby too and it gets me so pissed idk why obviously I won't anyone else besides my husband and I name our baby but why does it poss me off so much ?