OT: Another Portuguese (?) question

Do any of our Port. speakers know whether a word like "cutão" or similar
exists, or used to exist-- it would pertain to knives/blades. It is not in
my little dictionary, but I think I've seen it elsewhere. Or perhaps old
Spanish?

Alternatively, do any of our Japanese scholars know the origin of _katana_
"sword" (perhaps the Samurais' sword in particular, I'm not sure)?

In addition to the Jap. word, I find "katana ~k@tana" = knife in old sources
for various languages of eastern Indonesia/Ambonese area; since borrowing
from Jap. or vice-versa is not a real possibility, only Port. (less likely
Span.) remains as the only reasonable source in both languages.

Thanks in advance :-)
Roger

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