The suffix "-Regular" indicates the user is looking for the standard weight of the font family. In file naming conventions (e.g., canvasans-regular.ttf or canvasans-regular.otf ), this specific naming structure is common in pirated archives or unauthorized "ripped" versions of commercial fonts. Legitimate commercial packages are usually distributed as installer packages or protected font files that do not always expose the file name in such a raw format until installed.
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Contrary to popular belief, fonts are software. While the design of a typeface (the shape of the letters) cannot be copyrighted in some jurisdictions (including the US), the software (the digital file containing the vector data and hinting instructions) is protected by copyright law. The suffix "-Regular" indicates the user is looking