Then they all had several well-deserved drinks (building the telescope, etc., was hard work) and reflected further on the name for the planet. After a while they said
They thought this was a good idea but several “seas” could be seen and the plural of the Latin “mar” didn’t sound right. Finally they said
Besides, they thought, that was also the name of one of the old Greek or Roman gods! (Or was it Byzantine? Oh, well. Who cared!)
And so the planet was named after its many vast oceans and seas: Mars.
Aye! 'Twas some time ago, in a different life, me heartie (or me lass, as the case may bee). The seas/mars were reade and dusty, and smelled of ammonnee. But they were wet, they were, they were. We sailed them all!, we did, we did; back in that other time.
The name Mars doesn’t come from the word for sea, silly! The Mars Bars corporation paid NASA to name the planet after itself, increasing brand name recognition. That’s how Mars got its name, just like how the Milky Way galaxy is named after another candy bar company. If Mars Bars hadn’t had the highest bid, we would all be looking at the planet Almond Joy through our telescopes.
Your theroy needs to be adjusted a wee bit. Milky Way is a prodcut of Mars, Inc. BTW: did you know that the headquarters of Mars, Inc. is just a few miles from those of the CIA?