If you want Katanas you should follow the Huntsman's Copse route. Far down that route (several areas after) you'll find enemies that can drop them, and in the same area a hidden item that lets you unlock a merchant that sells another one.
I switched to an Uchigatana myself after having used the Fire longsword for the majority of the game waiting to be able to turn it into a Magic weapon (I still haven't found the orestone that I need so I gave up and just went with an enchanted Uchi to mix things up a little).

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