Where did the names of Opis watches come from?

The clock Julius with the clock Caesar makes Julius Caesar.

There are also two watches with the names Tristan & Isolde or d'Artagnan , Athos , Porthos and Aramis .

What all these watch names have in common is that they are literary figures, sometimes based on personalities, sometimes freely invented by the author. But they always raise certain expectations, which we opis try to build the right watch for. Did we succeed?