Laconic comes from a place.
Mercurial comes from the planet.
Neither is the name of a person.
gerrymander??? …
Oh Yeah! Now I remember!!! It’s named for that guy who played the Beav on Leave It To Beaver!
The OP said “proper names.” Are place names not proper names?
An enthusiastic suitor is a Lothario or a Romeo. *Don Juan * and Casanova are in there, too.
A nomimee for an appointed office is treated harshly; he is Borked.
A heavily hyped, but failed new product is an Edsel, or a New Coke.
Rob the rich, pay the poor? You’re a Robin Hood, (who, in the stories, tormented one of my ancestors.) 
The OP also used as an example a word derived from the name of a person. That’s the way eponyms are normally defined.
So. We have conflicting evidence about the OP’s intent. Maybe if the OP shows up again we can get a ruling.
OK. However, the OP did not mention eponyms, only proper names. Wouldn’t the derivation of either be essentially the same process?
The commonest English word coming from the name of a real person is “guy”, which ultimately comes from Guy Fawkes (who may have been related to me).
“Panderer” or “to pander” is from a character from Chaucer’s Troilus and Creseyde, I believe.
Hermetically, as in to seal a vessel in such a way to keep the contents pure.
In addition to jayjay’s science/tech words, these come to mind:
[ul]
[li]Fahrenheit[/li][li]Celsius[/li][li]Kelvin[/li][li]Volt (a slight mod of Alessandro Volta’s last name)[/li][li]Mho (derived from Ohm, spelled backward)[/li][li]Bluetooth (the wireless protocol named for Harald “Bluetooth” Gormson)[/li][li]Linux (a slight mod of Linus Torvalds’ first name)[/li][li]Buffalo wings (named for the town, not the animal)[/li][li]and a lot of other foods and drinks (New York steak, Philadelphia cheesesteak, San Francisco sourdough bread, Denver omelet, Boston clam chowder, Manhattan clam chowder, Swiss cheese, Burgundy wine, Scottish ale, Irish whiskey…)[/li][/ul]
For some reason I thought there was a Spartan king named Laconis…guess not.
No…the planet is named for the person Mercury (a diety granted, but still). I’m not sure why you’d think a word meaning thief and swift came from an orbiting ball of rock.
Sanchez
Because the Online Etymology Dictionary gives the history of the word and you don’t?
to **bowdlerise ** (or bowdlerize for those across the Pond)
To edit by omitting or modifying parts considered indelicate.
So coined after the much derided actions of Thomas Bowdler. :rolleyes:
“Dr. Language” on one side; the Online Etymology Dictionary on the other.
And the OED:
People are free to decide which to go by.
Johnson.
Who’s the lucky guy this word is derived from?
Sadism and Machochisim
Don’t get me into Titsling, that was just a joke.
Spoonerism is named for Reverend something-or-other Spooner, who tended to stip the flarts of his words.