Actually Thanos' full name was never mentioned in the comics. It had never been implied that he had a full name. His original name had been Dione. After commiting the first murders in Titan (including his own mother), he was eventually called Thanos.
Thanos (Greek: Θάνος [ˈθanos]; UK: /ˈθænɒs/, US: /-oʊs/) is a Greek masculine given name and surname, a short form (hypocorism) of Athanasios 'immortal'.
At first, Thanos believes it to be some sort of trick, but is convinced once the future Thanos utters the name Dione, which Thanos's mother had planned to name him before she went insane.
Thanos was born to A'Lars, a member of the Titans, a race of powerful, god-like beings that evolved on the planet of Titan. He belonged to the royal family of Titan and was the adoptive brother of the Eternal Eros, who eventually left Titan.
Thanos' beloved, the hooded embodiment of the end, should make an appearance before the Thanos saga is over. Something about that cloaked figure and her skull visage standing next to Thanos is so iconic. Death's inclusion would make audiences understand (and fear) Thanos as he tries to burn a galaxy to win her love."
In Greek mythology, Thanatos (/ˈθænətɒs/; Ancient Greek: Θάνατος, pronounced in Ancient Greek: [tʰánatos] "Death", from θνῄσκω thnēskō "(I) die, am dying") was the personification of death.
Nebula appears in The Super Hero Squad Show, voiced by Jane Lynch. This version is Thanos' older sister. Nebula, based on the Marvel Cinematic Universe (MCU) incarnation, appears in Guardians of the Galaxy (2015), voiced by Cree Summer.
ErosStarfox. Eros grew up on Titan alongside his brother Thanos, embracing all the pleasures that life has to offer. He laters becomes Starfox and an official member of the Avengers.
Thanos' brother Eros, aka the adventurer Starfox, is officially the Mad Titan's "equal and opposite." Eros was created in the same experiments that created Thanos. But while Thanos was a failure, Eros was the perfect result.
Thanos is a boy's name of Greek origin and flows from the name Athanasios, meaning “immortal.” Thanos is known in Greek mythology as a shortened name for the Greek god Thanatos.
Thanos and Hulk have clashed several times in Marvel lore, with Thanos even admitting he was scared to face the Hulk before acquiring the Infinity Stones. While Thanos is usually the victor, it's generally down to him using superior tactics and technology, rather than simply possessing greater physical strength.
A quick, comedic scene in Vol. 3's Orgocorp heist teases some potential romance between Peter Quill and Nebula, but James Gunn claims that it was never going to become anything more (per The New York Times).
Unfortunately for the Mad Titan, this ability isn't inherent to his nature as it is for the Greek gods, and could be revoked if Zeus pulled the right supernatural strings. Armed with the Infinity Gauntlet, the fight is Thanos', but otherwise Zeus is the more powerful being.
Omega was the most powerful member of the Thanosi. The Thanosi were powerful android, clone and mystical doppelgangers created by the mad Titan, Thanos. Realizing that he had made countless enemies and that living was a danger in itself, Thanos felt the need to create trusted allies.
Thanos' paternal grandfather is Kronos, the former leader of the Eternals on Earth. This does make Thanos an Eternal as well; although his physical mutations mark him as a Deviant. Regardless, the Eternals family line started by Kronos and his wife, Daina. Their union produced two sons: A'Lars and Zuras.
The fierce warrior Nebula is the adopted daughter of Thanos and the “sister” of Gamora. As the Mad Titan raised his “daughters,” he trained the two in combat, often forcing them to face off against each other.
