[Spoilers] One Piece - Chapter 1189 Discussion

Pretty sure all those blades/weapons named are parts of history/myths/legends.

Gram is from Norse mythology https://en.wikipedia.org/wiki/Gram_(mythology) The sword that slaid the dragon Fafnir

Longinus is named for the soldier that stabbed Jesus with a spear https://en.wikipedia.org/wiki/Longinus

Fragarach is from Irish mythology http://en.wikipedia.org/wiki/Fragarach an unblockable sword that weakens its foes

There's nothing specifically special about Xingtian's axe itself, but Xingtian himself continued fighting even after decapitation https://en.wikipedia.org/wiki/Xingtian

There are a few others that we don't see but are mentioned

Tohu referencing the Jewish idea of formlessness before God created everything https://en.wikipedia.org/wiki/The_World_of_Chaos_and_The_…

Nemesis referencing the Greek goddess of retribution https://en.wikipedia.org/wiki/Nemesis

Muramasa is named for the Japanese swordsmith https://en.wikipedia.org/wiki/Muramasa

I'm least certain about Vohu/Bohu, but there is a Zoroastrian concept about good purpose, mind, and thought https://en.wikipedia.org/wiki/Vohu_Manah. It's also possibly a twin to Tohu https://en.wikipedia.org/wiki/Tohu_wa-bohu