It appears Avalon still practices the ancient naming system - drop the baby on the keyboard and write down whatever appears on screen.
You can blame ancient Arthurian Welsh legends for those. When I went looking for more names to add to the family tree, they contributed extensively.
Names of rulers were chosen by random number generator from the following lists:
Male names: Constantine, Madog, Gormant, Eliwlod, Kyduan, Amr, Gwydre, Llacheau, Duran, Loholt, Mordred, Aristes, Adeluf, Morgan, Patrick, Tom, Arthur, Uther
Female names: Gwyar, Eigyr, Gwenhwyfach, Guinevere, Eleirch, Morgan, Morgause, Elaine, Amy, Igraine, Hilde
The ruling line has followed this route:
Arthur (m) -> Guinevak (f) -> Eigyr (f) -> Llacheau (m) -> Morgan (f) -> Duran (m) -> Gwyar (f) -> Tom (m) -> Kyduan (m) -> Gormant (m) -> (current) Eliwlod (m)
Yes, there was a King Tom.
The naming schemes for the weapons just about makes sense (still not sure on Avalon using the name of ancient oriental swords) but why then call the gunship Broadsword when the missiles are all named after swords. Perhaps it is a cunning plan to confuse the enemy?
Ship names will be changed to match the lead ship of the class, which is why its initially project BROADSWORD, as that isn't the final name for the ship.
The Kingdom is inclusive of the mythology and history of all its subjects, and won't force an exclusively English/French culture on its subjects.
In any event the catfish bomber is a bold choice. Even if one chose to use fish for light aether craft there are surely better choices before one gets to that? Off the top of my head one has the Swordfish, Shark, Orca, Sarcastic Fringehead, Bastard Mullet.
Blame Steve for including the humble Catfish in the carnivorous fish naming scheme, and the random number generator for selecting it.
In universe, the reason for the name is because the B-1/A is so ugly only its builders can love it.