There is no Hebrew name for Bea. Bea is a nickname for a number
of different English names (such as Bernece, Beatrice, Beatta,
etc.), but it has no equivalent in Hebrew.
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It's an American name meaning "blessed". My name is also
Bea.
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You can say: Olá, sejam bem-vindos, or Muito bem-vindos, or
simply Bem vindos!