Agreed. [リューカ] feels like it was definitely meant to be Japanese wordplay, and they (the official release) just went with the lowest effort translation of "Leuca" because it's written the same as the first half of "leucadendron", which is also definitely intentional because the -ka ending to a girl's name (written as [花] but homonym to [カ]) means "flower", BUT the [カ] "chikara" kanji (rather than katakana's ka; yes, they look the same) means "power".
So basically.
Ryuuka = Girly Dragon
Ryuuka = Dragon Flower (and remember that flowers in general assert femininity)
Ryuuka = Dragon Power
Ryuuka = Leuca(dendron)