Xu's surname is named

Male:

XuRuiYang (symbolizing auspicious sunrise)

Xu Ruifeng (wise pioneer)

Xu Wenxuan (literature; Grand appearance)

Xu Zhengyuan (politician; Profound knowledge)

Xu Jintao (bright future; Langtao)

Female:

Xu Jialei (good bud)

Xu Jiayi (good mood)

Xu Yawen (elegant cloud)

Xu Jingning (quiet)

Xu Wenxuan (Wen = a patterned cloud; Xuan = a kind of grass that forgets worries)