Phonetic transliteration of a foreign name.
西 (xī, 'west') is reused as a sound in many Western names;
瑞 (ruì, 'auspicious') is a favourite second syllable because of its positive meaning. Same pattern:
玛瑞 (Mary),
拉瑞 (Larry),
亨瑞 (Henry — though usually
亨利).
