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I don't personally know any Finns, but it's a common name, friendly and unstuffy, and I wouldn't expect it to be short for anything.
Oisín = very tall, dark haired, lovably silly, a bit of a hippy, former housemate. Generally known as Osh. He did get a lot of mispronunciation, living in the UK: people either thought his name was pronounced like hoisin sauce, or was spelt Ocean. The Welsh version Osian (OSH un) is very common in Wales and I know several. I like both versions.