It all stems from the use of the words 'All Blacks'.
LRFC have been known as the Cornish All Blacks since they were formed in 1948. In those days of austerity, finding complete matching sets of rugby kit was very difficult and expensive. The players of the newly formed club therefore sought to produce matching kit from whatever was available. Some players took other kits and dyed them to a uniform colour and black was the easiest to match. Others made kit out of blackout curtains. The nickname Cornish All Blacks was coined at that time and has been the nickname of the club ever since. I have yet to come across anyone who has mistaken the two teams but the New Zealand RFU are objecting to LRFC's move to trademark the 'Cornish All Blacks' name to stop people from counterfeiting our kit. They have threatened to sue us.
It's interesting to note that the New Zealand national team became known as the ‘New Zealand All Blacks’ during a tour to the UK and a match in Cornwall when a pressman mistakenly referred to the visitors as the ‘All Blacks’ rather than the intended ‘All Backs’ in reference to all their points being scored by their back division.
The Cornish All Blacks are a community based club in