"turning up everywhere," 1837, from ubiquity + -ous. The earlier word was ubiquitary (1580s), from Mod.L. ubiquitarius, from ubique. Related: Ubiquitously.
1579, from M.Fr. ubiquité (17c.), from L. ubique "everywhere," from ubi "where" (see ubi) + que "any, also, ever," a suffix that can give universal meaning to the word it is attached to. Originally a Lutheran theological position maintaining the omnipresence of Christ. Ubiquitous in the sense of "turning up everywhere" is first recorded 1837, originally a jocular extension of the theological word.