How would a massive space creature evolve?

It makes sense to believe life is more likely to evolve on the surface of large objects like planets, moons, and asteroids. However, a common fantasy trope is the massive space creature: some kind of vast spacefaring organism travelling between planets or stars, typically ancient and often sentient. I love the idea, but I have a hard time coming up with a sound scientific explanation to such a creature's origins.

What conditions would be necessary for such a creature to realistically come into being? No magic, no artificial intervention, no interdimensional rifts. I don't care about the details of the creature's biology: it could be a giant jellyfish, or a giant turtle with elephants on its back, or a living planetoid, or a form that defies all human comprehension. It just needs to be big, spacefaring, and have realistic origins.

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How would a massive space creature evolve?

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