Actually, if you use the /timer command without specifying a name, mIRC automatically gives the new timer a numerical name to avoid conflicts.
To test this, do something like this:
/timer 1 30 echo -s this is the first timer
/timer 1 30 echo -s this is the second timer
/timer 1 30 echo -s this is the third timer
/timer
The first three lines will create timers (note no names are given to the timers), and the last line will list all active timers. You should get a display similar to this:
* Timer 1 30s delay echo -s ....
* Timer 2 30s delay echo -s ....
* Timer 3 30s delay echo -s ....
The "1 2 3" part is the automatically assigned name for that timer.
-genius_at_work
