Wait!
Siri said that
Henrietta is a popular name for a HEN where she lives. I doubt your future daughter would travel in the same circles . . . .
Seriously, if this is really an important issue for you, you can always check out lists of most popular names. Here in the U.S., the U.S. Social Security Administration has a list on their web page. I think even BtN.com might have a link. Other countries post lists as well.
I'm sure you're little
Henrietta will be a stand out where ever you are.