Part of it is that the really good descriptions for how names (and the history of Latvia) worked were in one set of sources, and the dated examples of names were in another. So it looks like a lot because there wasn't much "crossing over" in terms of referring to a single source that covered names and history.
Fortunately, the National Library of Latvia has some excellent online resources that have been digitised and have had a very nice (but not 100% perfect) OCR job done on them. So if a source mentions a particular name, you can often search for that precise spelling to figure out if it's from the SCA's period or not.
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Fortunately, the National Library of Latvia has some excellent online resources that have been digitised and have had a very nice (but not 100% perfect) OCR job done on them. So if a source mentions a particular name, you can often search for that precise spelling to figure out if it's from the SCA's period or not.