ANSWER:

These are all efforts of our scholars to compile what they think are the names of Allah. However, no one can guarantee that these are the names as there isn’t any authentic hadeeth listing them.  

Authenticity of the 99 names of Allah, I’ve heard only 69 names are authentic. Is it true? What about the other names that we use?

Names and Attributes of Allaah | November 4, 2018 6:26 am
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Recently I have come to know that the 99 names of Allah are weak, (the hadith is sahih but not the names) The names have been classed weak by tirmidhi, ibn majaah and others.
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After memorising the 99 names of Allah Subhanahu Wa TaAla what one should do?How & When the Names should be recited and can it be a part of daily dhikr?