Is there a policy or a rule about cases of the combination of Alef-Vav in  non-Hebraic names like Taub, Braun, etc. that are written in Hebrew?

Do we consider the Alef as a consonant or not?

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Answer:

It was decided in remote antiquity that such names would have "a'u" in them when they appear in
Hebrew contexts--that is, treating alef as a consonant.