Transliteration of Jackie/Jacqui (the feminine form).
洁 (jié, 'clean/pure') handles 'Jack-/Jac-' and signals a feminine name through the auspicious meaning, while
姬 (jī) — historically a name suffix for noble women — acts as a feminizing transliteration syllable for '-ie/-y'. Compare the male
杰克 (Jiékè, 'Jack'): the female name uses softer characters with positive meanings.