Meaning of the word: Long ago, tall, slender, and hollow reeds grew on the banks of the Jordan and the Nile Rivers. The word for reed in the Hebrew, Arabic, and Egyptian languages was kaneh. The word passed over into Greek and Latin, and into the languages of western Europe.
A rather remarkable word family grew from the root canna.
Some are easy to trace back. Sugar "cane", a walking "cane", even a "cannon" are all clearly related to the reed in shape. With just a little imagination, the words "canal" and "channel" can also be associated with a pipe or groove. It is probably more difficult to see how the word canon, or "law", derives from the root meaning "reed".
Since reeds were long and straight, they were often used as measuring rods. From this concept, "reed" came to mean "a standard" and ultimately, "an authoritative standard", or "law".
Most likely Trzcinko refers to measuring rods or uses by occupation?