亚尔 is a building-block transliteration rather than a standalone name — it shows up inside longer foreign names and place names where 'yar' or '-ar' appears (e.g.
亚尔丁 'Ardennes', and the game-character 'Yar' in JRPG localizations). The
尔 here is the typical Chinese choice for an English/French '-r' sound.