Constellations in Teyvat are named in an ancient language, one that is no longer spoken.

[ And so, she names this newfound constellation in another language far from Nipponese and Inazuman. She seems happy to do so, sharing a small part of her with Cloud due to this.

Heh, she's glad he's not mad for her little tease. ]

Princeps Venustus.. [ That's the name she would give his constellation. ]
Prince Charming.

[ ^_^! ]