I wouldn't. Chances are she'd be a red-head!
Churchill's choice always puzzled me. His other children -
Diana,
Sarah,
Randolph - had names with strong family traditions, which is fine, and is actually the only reasonable way to use
Randolph, and then the moment they ran out of acceptable family names they plunged straight into 1920s whimsy. Perhaps they were just glad the War was over; with current naming fashions being what they are, she could have easily been
Poppy, which is worse than
Marigold I think.
But what I find creepy is that their final daughter, born after her sister's death, was
Mary. Too close for comfort.