Recommendations Nobles, 3rd son, marriage, and all the tropes~

《Looking Forー》
【Male Protagonist】
【Born into noble/royal family】
【Child Protagonist】
【Arranged Marriage】
【Nonserious plotline - comedy/comedic-undertone】
【Magic & Swords】
【Overpowered MC】
【Academy】
【Non Chinese/Korean like names (i.e Lin Xia, Quin Li, etc.)】
《Strike through are optional.》

 

Maybe "Chronicles of an Aristocrat Reborn in Another World – the Apostle of the Gods Who Know No Self-Restraint"

 

Read it, love it. That's how I started the noble trope.

 

Other that come to mind are these two, but they aren't exactly what you want as they lack certain tags but worth the try:
Isekai Tensei Soudouki
(Um, Sorry) I’ve Been Reincarnated!

 

I think I've, at some point, added the first one to my reading list- but I removed later for some reason I currently don't recall. The last one is not my cup of tea... or rather I just have strange taste.
Ty~