A human cultivator could become a Holy Man or Holy Woman if he or she reached the Immortal Soul Stage. The so-called honorific title was how others would call someone when he or she reached the Immortal Soul Stage.
But it need not be a Holy Man or a Holy Woman at this. For example, the Great Zhou Empire's Imperial Envoy, Li Yao, was normally called the Cheng Yun Elder.
One's honorific title was usually conferred onto them by their elders. If their elders perished early, then they could confer their own honorific titles.
In most circumstances, they would change their Daoist names to give themselves their honorific titles. But there were exceptions too.
Xiao Yan, Zhu Yi, Wang Lin and Shi Tianhao had already formed their Immortal Souls for quite some time. But Lin Feng had yet to give them their honorific titles. Xiao Yan and the other 3 didn't take it to heart either. They didn't mind waiting for the rest to form their Immortal Souls first.