Given name: Atem​

Meanings of names: Atem (most likely comes from Atum, an important deity in Egyptian mythology whose name is derived from "tem", which means "to complete or finish")

His real name is unknown in the majority of the manga and the anime because he has amnesia, so his goal is to regain the lost memories of his ancient past.  He is known as Yami Yuugi, King, or Nameless Pharaoh before his true name is finally revealed:

闇 (yami): Japanese origin for "darkness"
(See Mutou Yuugi's info for the meaning of the name Yuugi.)
王 (ō): Japanese origin for "king"
名 (na): Japanese origin for "name"
も (mo): Japanese origin for "also" or "too"
なき (naki): Japanese origin for the suffix "less"
名もなき (namonaki): Japanese origin for "nameless"
ファラオ (farao): English origin for "pharaoh" in katakana

The given name of Atem's host, Yuugi, and "king" are in the title of the manga and the anime 遊☆戯☆王 (Yūgi Ō), which means "game king".  "King" has several meanings for both of them.  Atem is a king because he is a pharaoh.  Also, he and Yuugi are both game kings because they are the best in the world at games and dueling in Zero and DM.  The title is romanized as Yu-Gi-Oh! in the English translation.

Name in American dub: (Same as the name in the Japanese version)
Also known as: Pharaoh, Yami no Yuugi, Dark Yuugi, the other Yuugi, Yuugiou (game king), spirit of the Millennium Puzzle

Joined: March 18, 2011
Accounts: YamiYuugi-Atemu and Yami-Yugi--Pharaoh

Series: Zero, DM, GX
Appears in: Zero manga, Zero anime, Zero movie, Duelist manga, R manga, Millennium World manga, TRANSCEND GAME manga, The Dark Side of Dimensions, DM anime, Pyramid of Light, Capsule Monsters, Super Fusion! Bonds That Transcend Time, GX manga chapter 1 (in Yuuki Juudai's thoughts), GX anime

Species: Human​

Birthday: July 26 (His original birth date in the manga is 19th of the third month of Harvesting season [Shemu] in the Ancient Egypt calendar, which is roughly converted to July 26 in the Gregorian Calendar.)
Age: Spirit of over 3,000 years (died at age 16)
Height: 153 centimeters, 1.53 meters, slightly over 5 feet, 60.2 inches

Weight: 42 kilograms, 92.6 pounds
Gender: Male
Hair colors: Blond (crooked, pointy locks), black (large spikes), and magenta (edges of large spikes)
Eye color: Violet
Blood type: A

Favorite food: Ta'amiya
Least favorite food: Batarekh
Born in: His palace near Thebes (modern Luxor), Egypt
Languages: Used to speak, read, and write Middle Egyptian fluently since it's his first language, but forgot most of it from his amnesia; speaks, reads, and writes Japanese and some English

Family: Akhenamkhanen (father), Akhenaden (uncle), Priest Seth (cousin), Abidos the Third (great great grandfather), Mutou Yuugi (Japanese descendant from 3,000 years after his own time period), Timaeus (Atlantian ancestor from 7,000 years before his own time period)
Best friends: Mutou Yuugi, Mazaki Anzu, Jounouchi Katsuya, Honda Hiroto
Rival: Kaiba Seto
Enemies: Yami Bakura, Yami Marik, "Bandit" Keith Howard, Anubis, Dark Dartz, Dark Alexander, Yubel (when she's evil), and anyone who harms his friends
Occupation: Ancient Egyptian Pharaoh
Interested in: Recovering the lost memories of his ancient past, dueling, the Heart of the Cards, saving the world
Duelist rank: King of Games
Deck theme: Strategy

Decks: [link]

   Also received:

   ~The five cards of Sealed (Exodia), including the head, right arm, left arm, right leg,    and left leg from Tenma Gekkou at [link]

Favorite card: Black Magician
Most precious possession: Millennium Puzzle
Personal quote: “It’s time to duel!”

Personal pronouns: 俺 (ore), sometimes 我が (waga)

Pages in Yu-Gi-Oh! Character Guidebook: The Gospel of Truth: [link] [link]