The dead forget OR the dead will be forgotten? Ecclesiastes 9:5
Correct: For their memory is forgotten.
This is true, how many people, musicians, actors, artists, politicians, prominent people of the years 1800 do you remember? possibly none, a generation goes and another comes on the scene but all are forgotten.
Solomon correctly assessed saying:
The sense of Eccl 9:5 is two-fold as explicitly stated in the verse:
For the living know that they will die; but the dead do not know
anything, nor do they have a reward any longer, for their memory is
Note the two halves of this verse:
The dead know nothing (are unconscious)
Their memory/memorial is forgotten (by those still living)
The rest ...
Answer: You are right: the dead will be forgotten. The people who still live no longer remember them; it's the people's memory. All translations you quoted have this sense, plus NIV ("even their name is forgotten") and ESV (same as KJV).
Two commentaries I consulted (by Tremper Longman and by Douglas Miller) confirm this. Both highlights two ...