Where does “settler” come from?

I need to work through this chain carefully, but I notice there's a problem: the chain provided doesn't actually lead to "settler" — it appears to be a chain for "settle" or "-er" suffix patterns, but the headword is "settler." Looking at the chain given, it seems malformed for "settler" as a headword. The chain shows Latin -arius and Old French -er as suffix elements, but these don't coherently connect to form "settler" from the root provided. However, I cannot write an accurate etymology sentence because: 1. The chain doesn't properly support "settler" as derived from these elements in this order 2. The "Known meaning: (unknown)" indicates the meaning of "settler" wasn't provided 3. There appear to be duplicate entries (Latin -are appears twice) suggesting possible data corruption I should not invent a coherent-sounding sentence that misrepresents uncertain data

settler (English): Someone who settles in a new location, especially...