There's nothing bad with it o_O Durandal is a short sword in FFXII and Rabanastre is the Capital City in FFXII, so it fits together. Also you shouldn't talk about Cornelia people "they can assimilate to Rabanastre", it sounds like you put them down, as if Rabanastre-People would be something special or better than Cornelia.

Sargatanas sounds cool imo too, hence it's a double-bladed weapon, which Zidane in FFIX uses.

I am so jealous of Masamune though. xD