IPA: /ˈsɛt.lər/
KK: /ˈsɛt.lɚ/
A person who creates a trust by placing their property into it for the benefit of others.
The settlor decided to establish a trust to manage their estate for their children.
Settlor → The word is formed from "settle" (from Old French *setler*, meaning to place or establish) and the suffix "-or" (meaning one who). A settlor is one who establishes or places a trust or settlement.
Think of someone who 'places' or 'establishes' something — that's what a settlor does.