Yes, this is my favorite subject
He is the brother of Finduilas. He was the son of Orodreth.
His full name is Ereinion, Artanaro, Rodnor Gil-Galad, but best known as Gil-Galad.
Gil-galad was the last of the High Kings of the Ñoldor-in-Exile in Middle-earth. An Elf of the house of Finarfin, he was named High King of the Ñoldor-in-Exile in Beleriand after the fall of the city of Gondolin and the death of the last High King, Turgon.
Gil-galad managed to escape the sack of the city, Nargothrond, although his sister was captured, and he fled to safety, probably reaching the Mouths of Sirion and then moving to the Isle of Balar. After the death of Turgon, the High Kingship of the Ñoldor-in-Exile passed to Gil-galad as the last surviving male member of the House of Finarfin. (His great-aunt Galadriel was still alive, but as she was the younger sister of his grandfather Angrod, his claim had precedence.)
After the War of Wrath and the end of the First Age, Gil-galad founded a realm in the coastal region of Lindon along the shores of Belegaer, the Great Sea. At its height, his realm extended eastward as far as the Misty Mountains, though most of the Eldar remained in Lindon and in Elrond's refuge of Rivendell. During most of the Second Age, Gil-galad enjoyed the friendship of the Númenóreans. A great Númenórean force helped him to repulse an onslaught by Sauron after the forging of the One Ring.
After the Downfall of Númenor and the establishment by the Elendili of the Dúnadan kingdoms in exile, Gil-galad formed the Last Alliance of Elves and Men with Elendil, High King of the Dúnedain-in-Exile, against the Dark Lord Sauron, who had survived the destruction of Númenor and returned to his land of Mordor. The armies of Elves and Men, victorious after the Battle of Dagorlad, laid siege to Sauron in Mordor. During the siege, however, both Gil-galad and Elendil were slain.
His spear was named Aiglos or Aeglos, meaning "snow-point" or "snow-thorn" or more commonly "icicle" because when orcs saw his spear, they would recognize it by its reputation to bring a cold death to them.
In the movie, he is portrayed by Mark Ferguson. And as you can see in my avy and siggy, this is how he looks like.