Things you can name your Aegislash besides 'Excalibur' and 'Masamune'

Oathkeeper. From Song of Ice and Fire. Brienne of Tarth's sword. It was melted down from Widow's Wail, but that's too long to fit.

Hrunting: Beowulf's Sword

Vajra: Sword of Hindu god Indra

Mournblade and Stormbringer: Twin swords from Eternal Champion

Brightkiller: Lancelot's sword

Legbiter: Sword of the Viking King Magnus Barefoot

Caledfwlch: Excalibur's original name

Lightbringer: Another Game of Thrones sword, but damn near every piece of fiction set in a fantasy setting has a sword called Lightbringer. I'm pretty sure it's in Final Fantasy too.

Orcrist: Goblin-killing sword from The Hobbit.