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Greetings,
According to "Dictionnaire Etymologique des Noms de Famille et Prenoms de France" by Albert Dauzat, the name "Ricou" derives from the Germanic given name "Ricwulf." It is also found in the variants "Ricoul," "Ricoux," and the Italian form "Ricolfi."
Josh Mittleman researched your name.
We hope this has been helpful.
Sincerely,
Alan Terlep
Academy of S. Gabriel