余温尤存

This name can imply two situations. On one hand, it can mean that there is residual affection or warmth remaining from an end relationship. Here '余温' means remaining temperature which represents residual affection, and '尤存' means still exist. On the other hand, this phrase is used to denote a feeling of loss over things that have gone by, like old times and loved ones. In this situation, it's a metaphorical way of saying things are changed but memories persist.