Is allowed to say or put written ‘alaihissalam after the name of non-prophet?
Answer:
Ref. No. 41/1056
In the name of Allah the most Gracious the most Merciful
The answer to your question is as follows:
‘Alaihis Salam’ is mainly used for prophets. It is not allowable to use it after the names of others.
Darul Ifta
Darul Uloom Waqf Deoband