Yes, in the Hunter Chairman Election arc, it is clear that basically everyone who is a licensed hunter knows that Ging Freecss is Gon's dad, including Hisoka.
Ging Freecss | Hunterpedia | Fandom.
Now let's deep dive in some of the best ships, both big and small (& confirmed or not).3 Fanon: Laxus & Freed.4 Canon: Gajeel & Levy. 5 Fanon: Laxus & Mirajane. 6 Canon: Jellal & Erza. 7 Fanon: Gray & Lucy. 8 Canon: Gray & Juvia. 9 Fanon: Romeo & Wendy. 10 Canon: Zeref & Mavis.
As it turns out, Natsu died as a child, and Zeref went dark side trying to revive his brother. The attack killed the boy and his parents, leaving Zeref to grieve alone. In a desperate bid to change his luck, Zeref dedicates his life to resurrecting Natsu, but his decision makes him a magical pariah.
Earth Dragon Slayer Magic (大地の滅竜魔法, Daichi no Metsuryū Mahō) is a Caster Magic, Lost Magic, and a branch of Slayer Magic used by Kiyoko Kriya. So far, Kiyoko is the only known Earth Dragon Slayer in the series.