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Re: Origins
The original form of the name is Sinniger which comes from Alsace as you can see at tinyurl.com/y8tn2n2x and tinyurl.com/y7bxn9ra. It looks to be an alteration of a German name but I can't see what it could be.
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There is a Sincgar which may be an error for Sinegar, or vice versa, which Forstemann believed is a development of Sindgar, however he also lists several names under the prefix Sin-, possibly the common prefix meaning "ever, eternal, universal, infinite", or another meaning "old", or another word (sometimes spelled sinn) meaning "feeling". Each would fit the semantic pattern set by other attested name elements. The medial "i" or "e" is probably just from an oblique case of the prefix.
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