There’s also usage of that spelling in Magic: The Gathering. One of the biggest villain factions in the Lore of the game, Phyrexians, assimilate beings against their will and brutally “perfect” them through magical and surgical means. The process is called “Compleation” - https://mtg.fandom.com/wiki/Compleation

The recent arc of expansions for the game have heavily features the Phyrexians, so the spelling might be more common this year. https://trends.google.com/trends/explore?date=now%201-d&geo=...