When choosing a name, can I just give my first name without my last name?

Jingqi (a quiet and well-behaved girl)

Yalin (named after "Ya", which means "detachment and elegance")

Wanyu ( Wan means "docile, gentle" and "痗" means "beautiful")

Shuyi (quiet and pleasant)

Shiyin (poetry: means elegance and romance)

Lingjing (smart and quiet)

Ruijie (meaning smart girl)