Despite what the reference says, it doesn’t work. I just made a quick category in Mitsuku:
<category>
<pattern><bot name="name"/> 123</pattern>
<template>If you can read this, it works.</template>
</category>
and got this:
Human: Mitsuku 123
Mitsuku: That’s me. Why are you counting?
Which indicates that my category “Mitsuku *” was called instead of the bot name one. Just in case “Mitsuku” overrides “bot name”, I changed Mitsuku’s name to Mitsuku111, for which I have no categories, and got a match to * instead of the bot name category.