Names that click with readers often feel less like a label and more like a key. I used to agonize, trying to condense entire themes into clever wordplay, but that usually led to something overly opaque. What works better is to pull a resonant image or a line of dialogue from the heart of the manuscript. For a story about memory and loss, I had a character say, 'The house remembers.' That became the title, 'The House Remembers.' It's simple, but it carries the weight of the theme without explaining it.
Avoiding abstraction is the hardest part. 'Redemption' or 'Echoes of the Past' are thematic, sure, but they're also generic. A specific, concrete object tied to the theme creates more intrigue. In a piece about cyclical violence, a recurring 'Brass Button' from a uniform held more thematic gravity than any grand phrase could. It's about finding the physical artifact of your idea. Readers might not get the full theme from the title alone, but it should make complete, chilling sense once they finish the last page.