In some systems, this is called Ananko or Ananku. It has moves in common with Seisan and Gojushi-Ho which some say are both very ancient Chinese Crane kata.
It is claimed by some that Kyan Chotoku made the kata not long after he returned from his visit to Taiwan in 1929 (some believe the visit was in 1895.) He and his students had been touring there for a whole year. Some think that he didn't make it. They say it was a pre-existing kata that he learned from the Crane Masters in Taiwan. It is plausible that Hohan Soken learned about these Taiwanese Crane masters from Kyan Chotoku, because Soken at one time made a comment about them. Some of Hohan Soken's sai kata are actually versions of this kata adapted for sai. It is not known whether Soken got these sai kata from one of his weapons teachers, or whether he made them himself. If he got them from other weapons masters and they are ancient, then that is evidence that Anaku has been in Okinawa for quite some time. That would invalidate the theory that the kata had its origin with Kyan Chotoku. If Soken made the Sai kata himself, perhaps he created them from the version of Anaku that Kyan taught him.
Then there is another theory of its origin. Some say that it was brought to Okinawa by a Crane master by the name of Anan. Some believe that this master also taught another kata called Anan.