No he is not. Gon's father is Ging Freces, a high-ranking member of the Hunter Association who is many times stronger than Hisoka.
His mother is Alicia Freecs. She was a hunter and she died while exploring the dark continent. She and Ging met shortly after Ging became a hunter. They headed on many wonderful adventures together.
6 Strongest: Ging Freecss After passing the 267th Hunter Exam, Ging went on to become a Double-Star Ruins Hunter. According to the former Chairman Netero, Ging Freecss is one of the 5 strongest Nen users in the entire world. Ging's skills remain a mystery, mostly.
It was probably for the best that he left him with Mito. Additionally, Ging was fairly young when he had Gon, he was only twenty. Ging isn't a terrible person, he's flawed, but not without empathy.
Ging Is one of the top 5 nen Users in the world, and may actually be stronger than Old Netero. Ging was shown beating up multiple hunters with ease, and began talking to Gon while beating them up.
Ging has become very rich and is as powerful as a president of a country. He is currently a Double-Star Hunter and qualifies for a Triple-Star License, but because of his shyness and stubbornness, has not applied for one.
Netero knew that Gon was Ging's son just as surely as he knew Killua was Silva's. It's also probable that Netero was in constant contact with Ging, keeping him informed of Gon's progress.
In fact, while Attack on Titan author Hajime Isayama did pitch his story idea to Shonen Jump, it was ultimately rejected. It's a decision the behemoth likely regretted following the series' quick success in Bessatsu Shonen Magazine, a publication known for titles like A Silent Voice and xxxHolic.
Attack on Titan is serialized in Kodansha's Bessatsu Shounen Magazine. As the magazine's name suggests, it is a shounen magazine. In fact, even if the manga doesn't fit all the demographic, characteristics, and themes of a shounen, as long as it is serialized in a shounen magazine, it is considered as shounen.
There are seven continents in the world and Asia is the largest, and according to land-mass, Australia is the smallest at almost a fifth of the size of Asia, but Europe is not far behind as it has just over a million more square miles than Australia.