This calculator performs a logical XOR of the values that you enter, and then uses a standard byte mapping to translate the results into seven-segment display digit patterns.
When you enter all of the hexadecimal answers into the calculator, the seven-segment display will show the word JO surrounded by two blanks (which are mainly meant to prevent people from guessing four-letter names!). This is the answer to the hacker cat’s name.
Entering a smaller number of answers will probably not do anything useful due to the way that XOR works, although conceivably if you had six correct answers you could look into the way seven-segment display inputs are represented as byte values and rule out possible byte values that wouldn’t produce a letter output. To do this, though, you would also have to entertain the possibility of blank spaces in the output.