Port names can be changed to start at 01 (i.e. ttya01) instead of 00 (i.e. ttya00) on systems running udevd by modifying the UDEV rules:

Edit "/usr/bin/dgrp_udev" and find this line:
 
TMPPORT=`echo $STRING1 | /bin/awk '{print $4}'`
 
And add this below it:

TMPPORT=`expr $TMPPORT + 1`