Phonetic transliteration:
厄 (è) approximates the "Eur-/Ur-" or "-ers" sound,
斯 (sī) is the standard Chinese rendering for an English "-s" or "-ce."
厄 itself means "distress/calamity," but in transliterations it carries no meaning. Used for various names — e.g. Ers (a Marvel cosmic character), or as part of longer names like
厄斯金 (Erskine).