Brand names structure and semantics, analysis, etymology, marketing etc. what could be a good thesis for this topic?

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I'll throw out some ideas for you:

-A phonetic analysis of i.e. snack brands vs. car brands vs. soap brands. See what the most common phonemes are for different categories of brand names.

-Get transcripts of radio or TV ads and see what words or grammatical structures are most common for each type of product.

-Pick a few seemingly nonsensical brand names, i.e. Xerox, Lidl, Pepsi, and try to figure out the provenance of the names

Good luck!