Let's start with the politics: because the politicians did not find mutual agreement in time between the European Union and the United Kingdom, as of March 31, 2022, all mathematical, chemical, and physical units of measurement related to names of UK-born scientists will not be allowed to be used in the European Union and remain the exclusive legal property of the British Royal Academy of Sciences, Measurements and Distances.
Due to this overseen part of the Brexit deal (Agreement of the Withdrawal), it will not be possible for the EU to use several important measurement units, such as Newton, Watt, Joule, and many others. There is still some discussion going on about Kelvin, as he was Scots-Irish. The 'rights' (including lithographic and digital) will also extend to any images relating to the units in question with any pictures or representations of, say, Sir Isaac Newton pondering how an apple falls from a tree the said apple must now be, explicitly, an English Pippin variety (unbruised).
The missing agreement works in both directions, so British engineers have to do without Pascal, Hertz, Tesla, and many others - and other SI units of course.
The issue cause
The most relevant question must be: How come, nobody noticed this fact during the Brexit discussions between both parties?
The answer is unfortunately obvious. It was all caused by Sir Isaac Newton and, by extension, his laws. To make a long story short; this specific part of the Brexit deal fell out of favor from the Brexit committee table and was found when all the deals were already closed. The names of the engineers, physicists and scientists concerned are all trademarks of the respective countries, hence the confusion.
The Brexit deal - drawn up by politicians from both sides of the English Channel (not La Manche) - concentrated on the so-called important stuff regarding border control, subsidies and employment. It was so complex that it was instrumental in one British Prime Minister leaving their post.
Suffice to say that the deal not only divided Europe but also the United Kingdom. But there were few engineers involved in the fine print of the deal (or if there were, they were not neutral). This is why the naming conventions were missed in negotiations.
