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Greetings,
Here's the information we found on your proposed Italian byname, "la Castana Topa," meaning "the brown mouse."
We found examples of both "Castano" (also "Castagno") (1) and "Topo" (also "Topino.") (2) "Castana" and "Topa" are correct feminine forms of those names. We didn't find any evidence for longer bynames like "la Castana Topa." We recommend using either "(la) Castana" or "(la) Topa."
Arval D'Espas Nord contributed to this letter.
We hope this has been helpful, and that we can continue to assist you.
In service,
Alan Fairfax
Academy of S. Gabriel