There's a subset of people in Ireland who are legally required to write down an ID on their vehicle, that can be matched to a name/photograph in seconds.

https://www.transportforireland.ie/getting-around/by-taxi/dr...

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Additionally, in plenty of European Countries, it's pretty common to write your name on your address: https://c8.alamy.com/comp/B01RP4/personal-name-plates-at-blo...

My name is on my car, the license plate can be matched to my name in seconds.

To those who have access on the registry - yes. But not everyone knows the name because they do not have access to the registry.

Writing it down would give more information to everyone else at all times.

Would you not? It would look odd and draw a lot of attention simply for being unusual, but I'm struggling to come up with any way in which doing so would actually harm me.

If you do it right now I will reveal my answer.