我姓张却不是他心脏
[wŏ xìng zhāng què bù shì tā xīn zàng]
'Although My Surname is Zhang, It Doesn't Make Me His Heart'. The surname 'Zhang' phonetically resembles the Chinese character for heart/organ (心 Zhang); this play on words indicates that although namesakes exist, they do not imply deeper personal connections - i.e., surnamed alike yet not his beloved/important individual.