Aker is an angel mentioned in the Greek Apocalypse of Ezra whose name was revealed to Esdras

Esdras

Esdras is a Greco-Latin variation of the name of the scribe Ezra. It is found in the titles of several books, associated with the scribe, that are in or related to the Bible.-Differences in names:...

 as one of the nine angels who will govern "at the end of the world." The nine angels mentioned are: Michael, Gabriel

Gabriel

In Abrahamic religions, Gabriel is an Archangel who typically serves as a messenger to humans from God.He first appears in the Book of Daniel, delivering explanations of Daniel's visions. In the Gospel of Luke Gabriel foretells the births of both John the Baptist and of Jesus...

, Uriel

Uriel

Uriel is one of the archangels of post-Exilic Rabbinic tradition, and also of certain Christian traditions...

, Raphael

Raphael (archangel)

Raphael is an archangel of Judaism, Christianity, and Islam, who in the Judeo-Christian tradition performs all manners of healing....

, Gabuthelon

Gabuthelon

Gabuthelon is an angel mentioned in the Greek Apocalypse of Ezra whose name was revealed to Esdras as one of the nine angels who will govern "at the end of the world." The nine angels mentioned are: Michael, Gabriel, Uriel, Raphael, Gabuthelon, Aker, Arphugitonos, Beburos, and Zebuleon. ...

, Aker, Arphugitonos

Arphugitonos

Arphugitonos is an angel mentioned in the Greek Apocalypse of Ezra whose name was revealed to Esdras as one of the nine angels who will govern "at the end of the world." The nine angels mentioned are: Michael, Gabriel, Uriel, Raphael, Gabuthelon, Aker, Arphugitonos, Beburos, and Zebuleon....

, Beburos

Beburos

Beburos is an angel mentioned in the Greek Apocalypse of Ezra whose name was revealed to Esdras as one of the nine angels who will govern "at the end of the world." The nine angels mentioned are Michael, Gabriel, Uriel, Raphael, Gabuthelon, Aker, Arphugitonos, Beburos, and Zebuleon. Beburos is...

, and Zebuleon

Zebuleon

Zebuleon is an angel mentioned in the Greek Apocalypse of Ezra whose name was revealed to Esdras as one of the nine angels who will govern "at the end of the world." The nine angels mentioned are: Michael, Gabriel, Uriel, Raphael, Gabuthelon, Aker, Arphugitonos, Beburos, and Zebuleon. Zebuleon...

. Aker is not considered an archangel

Archangel

An archangel is an angel of high rank. Archangels are found in a number of religious traditions, including Judaism, Christianity and Islam. Michael and Gabriel are recognized as archangels in Judaism and by most Christians. Michael is the only archangel specifically named in the Protestant Bible...

 and is a non-canonical figure. Theologians surmise that Aker may be comparable to Kyr.