A diminutive is usually a shortened version of a name and one that, while not official, is commonly used for a specific name. Sally for Sarah and Peggy for Margaret are good examples of diminutives and diminutives are usually based on the actual name. Nick names are usually an alternate name for a person and are often based on something other than the name–hair color, size, or some other characteristic.
Spelling errors are renderings of name based on clerical error, how the name was said, or how the name was heard. They aren’t a different name, just an incorrect or variant spelling. Diminutives and nick names are different from the name are usually do not sound exactly like the original name.
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