I have a Bow Knight Shura with a spy's yumi called Peekaboo! and a Setsuna's yumi called Drop Em!
Gave my Witch Rhajat a ginnungagap called THE WORLD!!! (totally saving this for Odin when I get Revelations)
Hisame has a Hana's katana named Mother's Parry (Hana is his mother) and Hinata's katana named Fool's Strike (we all know why)
For Caeldori she has a Subaki's pike called Pefect Attack and a Hinoka's spear called Graceful Dodge
Asugi has Sweet Crits (Barb shuriken), Dwyer has Sleeping Lambs (Sheep spirit) and last but not least Shiro has The Blocking (Guard naginata) and The Poking (Brave lance)
This is actually the most I've nicknamed weapons in a Fire Emblem game