Kraken City...
Kraken City got its name after the battle between the massive sea monster and humans, in which the monster fell. The human later became known as the Human God, the first one.
Back then, the town that was located here had a different name. It was renamed as Kraken Town in honour of the human professional who saved the town from total destruction.
Also, it was his hometown. So, no one felt it was wrong to rename the town as Kraken Town, which grew into a city later on, which was also due to him.
No one remembers his real name anymore, and he was called Kraken for defeating the massive sea monster. Now, only a few people in the world even remember his actual name.
The city was not only famous for being the hometown of the first Human God, but also for its vast and high-quality sea resources produced every year. Unknown to the public, the city holds a large prison, where many dangerous criminals are held.