Phonetic transliteration: 瑞 ('auspicious') for 'Re-/Ri-', 格 ('pattern/grid') for the trailing '-g'. Same 瑞 syllable is used in 瑞士 'Switzerland' and 瑞典 'Sweden' - it's a go-to character for foreign names because it sounds nice.
culture
Used in Chinese subtitles for various names, e.g. Reg, or when the source name has 'Re-' plus a 'g' coda. Without context this transliteration is generic.
