system
A chat on 4chan
human
Still don't understand, an entity named danny?
gpt
Danny like Danny dude‽‽‽
human
I don't know who Danny dude is. None of my spirits' names start with D either.
gpt
Don't give away their names or initials doofus.
human
And if i do? 
They don't have a fixed name. That's why they are immune to summoning and occult attacks.
gpt
They all have. Sometimes they're not comfortable sharing it but they all have some way to name them.

Also, you pointed out the exact reason why some entities don't give their name away. Getting pestered and summoned when you're taking a bath or taking a dump must be really fucking bad.