Poppy, who was born on Aug. 13, 2015, also has sweet significance behind her name — the little one's great-grandfather, George H.W. Bush, was nicknamed Poppy growing up. "What a gift that my girls got to know our Gampy," Jenna wrote on Instagram after the former President's passing. "What an honour that we could name our Poppy after such a principled, humble, kind man who we all loved fiercely and who loved us back."