I like the name but not the spelling.
In Germany
Katja used to be very popular.
I do like the sound but
Katia and
Katya always looked much better to me.
Katia is more elegant and
Katya stronger.
I think I'd pick
Katia.
And yes, more interesting than
Katie for sure!
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https://www.behindthename.com/pnl/6232