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Sam's a common diminutive. If it becomes an issue or something comes up where you use a full name, just give him something a little more formal, if it's bothering you. Call him Sam, and if his full name needs be used, say that he's legally Samuel, Sampson, or even Samhain if his parents were cultists. He just prefers Sam. Giving him a sense of preference is part of character development. It says something about him and it gives a sense of either kinship with others or independence from his upbringing, depending on how you work it.

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If you really just want to use straight-up Sam with no formal name, you're looking at having a more homely family life. There's nothing wrong with that either. It all depends on your character.