Where does “bard” come from?

I appreciate the thoughtful rules, but I need to flag a problem with this chain: it's circular and doesn't make linguistic sense. The chain shows French barde → Old Irish bard → French -er → Latin -are, then repeats the same pattern, which would mean we're going backwards and forwards between the same languages. For an accurate etymology sentence, I'd need a properly ordered chain showing the actual historical path of the word (e.g., English bard ← Old French/Old English ← Old Irish bard ← Proto-Celtic, or similar). Could you clarify or correct the chain? Once I have a coherent sequence, I can write an accurate one-sentence summary following all your rules.

bard (English): A professional poet and singer, like among the...