Emrys is the Welsh form of the Latin Ambrosius, meaning immortal or enduring, a name tied in legend to a prophetic figure who influenced the Arthurian tradition. It suggests permanence -- something that outlasts its immediate moment rather than fading with circumstance.
Divers Effects of the Stars are drawn forth from the stars, according to the various dispositions of the matter; whereof the Astrologer ought very well to examine the several natures and qualities of the subjects receiving. - William Lilly (1602.-1681.)