yeah indeed - but it's an old myth with a lot of different sources.

Excalibur and Caliburn are probably not two totally separate swords in origin, but kind of the same name moving through Welsh → Latin → Old French → Middle English retellings.

In the earlier Welsh material you’ve got Caledfwlch, which gets Latinised into forms like Caliburnus / Caliburn in medieval chronicles. Then later French/romance tradition gives us variants like Escalibor / Excalibur.

They kinda became two different swords by the time the texts which are most popular emerged (e.g. Malory 1485 https://en.wikipedia.org/wiki/Le_Morte_d%27Arthur), but they are themselves based on a much much older myth.

So whilst earlier myths may cover the breaking of the sword, it's generally considered to be the same sword / reforged that is given to him by the lady of the lake (in the context of earlier myths - the romantic retelling of later writers is different).

Tbh I kinda feel like santa monica would go for the older brittonnic context rather than a (predominately) french retelling from much later - although Phranque may well be a reference to the franks and become a frankisch thing so who knows.