Pokémon Mystery Dungeon introduced "lookalike" fake items, which have off-by-one-letter names. One of these sticks really hard in our head for what is most likely a coincidence. Oren berry.
It's well-known that oran berries, like most of Pokémon's berries, are named after a fruit. In this case, the orange. Oren meanwhile, is the Welsh word for orange.1
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Fruit and colour.
an addition for the non pokemon folks: the oran berry being named for the orange is imo made a lot funnier by them looking like this
also huh i just realised that the german name sinelbeere is probably based on apfelsine, another term for orange