1. Taoist priests generally use Taoist names.
Dao names are generally given in the order of the poems of each school's generation. In order not to violate the ancestors, the original surname remains unchanged, and only the generation is added after the surname. Later, the name and calligraphy of the Dharma were all given by my own master.
2. In Buddhism, monks are not monks; monks are monks.
Buddhism talks about the sign of no self, no sign of no one, and no sign of living beings, so names with secular names in them are signs of attachment. Generally speaking, all monks have Shi as their surname. Now that you have become a monk, you no longer have any nostalgia for your lay name. This is the first lesson in letting go of ego.
But Buddhism uses titles to show respect: such as Master Yinguang, Monk Jingkong, Master Xuecheng, or a certain elder or great virtue. When facing the old master, just call him "elder", or "master", or "old monk" or "old master", but never call him by his name.