Ka pua lahilahi pronounced kah poo-wah lah-hee-lah-hee
Aloha: iki pua [eekee pooah]
It means heavenly flower/ or heavenly child
Pua is the Hawaiian word for Flower.
Puanani
There is no Hawaiian word for buttercup, but you could say waiūpaka pua which means "butter flower"
Ka pua nani
It sounds like a bad attempt at someone who didn't know the hawaiian language trying to give someone a Hawaiian name. Technically it means, heavenly number one. 'ekahi being the number 1 and lani being Heavenly. I think someone was trying to say 'heavenly one (not number)' but didn't understand that there was no translation for that in Hawaiian. a Hawaiian would be more inclined to give a name like kamalani which means heavenly child/person.
天の花 (ten no hana) would be "flower of heaven" or "heavenly flower."It would be pronounced like "ten" (as in "10"), "no" (as in "yes or NO"), "ha" (like the "ha" in "hall") and "na" (like the "na" in "Narnia").
Leilani= Heavenly garland(lei)
Ki mai lani i hoʻokamalani [kee my la-nee ho ohka-ma-lani]
Aloha: pua 'alani [poo-ah ah-la-nee]
Heavenly Essence Floyd was the flower girl
Aloha: makana lani ka Male [ma-ka-na lanee ka Ma-lay]