@Guspaz Yeah, it should work. The name on GBF english translation are often inaccurate too, so no problem there.
Even the katanaka are in one word, and the english team on GBF already said that if there is any mistake in translation, we should refer to the original JP texts. ?
there also exists a Blade with the same name in Fire Emblem, Roy's game to be precise. It's wielder is Zephiel, King of Bern and main antagonist for that game, It's a sword capable of turning into a Staff/Spear-like form when it's not being used.
https://steamusercontent-a.akamaihd.net/ugc/92727459190802640/7D11E3D62732F2776EAA357DAE0717025681D8F7/
https://fireemblemwiki.org/wiki/Eckesachs
Eckesachs (Seax of Ecke), the sword that belonged to the giant Ecke before he was killed by Dietrich von Bern, who then took it for himself (replacing Nagelring).
Hmmm I just realized MC's gag is basically finishing things in one swing after training past his limits. So if there's One-Punch Man, then I guess this guy is One-Swing Man?