Phonetic transliteration of a Germanic / Dutch surname (most likely Zwakman). Standard mapping:
茨 ('cí', thatch) for 'tz/zw',
瓦 ('wǎ', tile) for 'va',
克 ('kè', conquer) for 'k',
曼 ('màn', graceful) for 'man'.
克曼 is a frequent ending for -kman / -ckman names.