Game of Thrones George Martin was bad with naming places.

[Valentis]

As well planned out and thought-through the world of Westeros and the characters are, George Martin had the laziest and poorly constructed names in fantasy and science fiction. He could not come up with anything more obvious to save his pen. It was one of his main weaknesses. These names are lazy with a capital L.

Winterfell
Iron Lands
High Garden
The Storm lands
Riverlands
Kings Landing
Essos

The names of his fantasy places all read like crop-out names created by a writer who is not fully experienced. J R R Tolkien was much more talented in coming up with names.

Lord of the Rings

Rivendell
Isengard
Mikwood
Gondor
Lothlórien
Rohan
Minas Tirith

JK Rowling was also above Martin, although the Harry Potter universe was not entirely made up like Lord of the Rings and Game of Thrones . The names of the wizarding schools and wizard towns names were more creative.

Wizarding World of Harry Potter

Hogsmeade
Godric's Hollow
Beauxbatons
Durmstrang
Hogwarts
Ilvermorny
Castelobruxo

Science fiction writers are more creativity than Martin. They did not leach off Mars, Jupiter, Venus, Saturn and Neptune.

Star Wars

Coruscant
Tatooine
Endor
Naboo
Serenno
Hoth

Star Trek

Vulcan
Qo'noS
Ferenginar
Romulus
Betazed
Cardassia

Unlike other creators, Martin only mostly seems to be twisting and adding words to common words like Winters, Kings, Gardens, Summers, East and Rivers to name places in Westeros. Nothing seem named from scratch.