in the first life ml called mc Yudrein?
when he's called Yuder?
Spoilers
1st time line is Yudrain. He didnt know what it meant and he wasnt able to ask Kishiar but in the current timeline, he was named as Yuder and when it came to a time when he was able to discuss the 1st time line with Kishiar, Kishiar told him what it meant --- iirc, it meant eternity or forever. And that the 1st timeline Kishiar didnt just name him randomly but named him fondly.
I hope the princess finds happiness and true love