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Guard and ward both trace back to the same Proto-Germanic root, something like *wardōną, meaning “to watch, to protect.” That root went into Frankish, then into Old French. But Old French wasn’t a monolith—the northern dialects (Picard, Norman) and the central Francien dialect treated initial w- differently. Francien eventually turned w- into gu-, while the northern dialects kept the w-.
So:
The result is that English has two complete word families from one root. You can guard a prisoner in a ward, or put a guard in the wardrobe (though that would be strange). A warden and a guardian are functionally the same person, historically.
This is what I love about etymology: the apparent redundancy of English isn‘t just messy borrowing. It’s stratified. Each layer preserves a different dialect, a different century, a different path.
Has anyone come across other doublets where the split happened before the word reached English?