Lars The overking of the ancient Etruscans, like the Welsh “pendragon.” A satrap, or under-king, was a lucumo. Thus the
king of Prussia is the German lars, and the king of Bavaria is a lucumo.

There be thirty chosen prophets,
The wisest of the land,
Who always by Lars Porsena
, Both morn and evening stand.”
Macaulay: Lays of Ancient Rome,
(Horatius, ix.)

So the "Lars" in Lars Porsena is his title, not his first name.