mashedpotatoes I am really sorry, this is so crap. I have not read all posts but have read all your posts.
Although I agree "...it's an easy trap to fall into, changing yourself to please the bullies, isn't it?" I would also say personally that if he wants to trial a different name at school, I would let him.
I would allow him to do whatever, within reason, helps him to cope with school. Because it is primarily affecting him. He needs to be empowered to cope in the way he wants to, as long as this does not lead to further issues, IMHO.
I don't think for a second anyone should have to dye their hair or change themselves etc etc but names do not always translate well. Having lived and traveled very widely people do sometimes adopt local names (e.g. Chinese students who have a western style name when studying outside China) to help them fit in (and I did the same when I traveled using a Chinese version of my name or whatever.
mashedpotatoes "To those who asked - yes, I took this up with the school in May / June. The teachers gave me an answer about tackling it but I wasn't convinced. I think it's up to us to work out a strategy at home."
Of course you can work out strategies at home for empowering your boy, and helping him manage any anger this behaviour creates or fuels in him.
However, it is the school's problem to tackle if this is happening to him at school with other pupils who the school has charge of.
I don't believe bullying is an English problem or should be seen as something a French school could not tackle. Indeed, I would say that for the school to suggest they cannot do anything would make them inferior to UK schools where robust (ha bloody ha) anti-bullying policies are in place. And this is bullying so a French school should not be able to get out of their responsibilities.
Please check out what French anti-bullying groups/charities exist (or French speaking in places like Canada). Please make school aware this is not your problem to solve but rather an issue happening at school and therefore their responsibility (in the nicest possible way!).
If they are in any doubt that France should be as firm on bullying as England attempts to be, please show them this...
I am afraid my french is not good enough to know what Harcèlement à l'école is all about but a place to start maybe.
education.francetv.fr/matiere/education-civique/ce2/hubs/harcelement-a-l-ecole
At least the first page is available in English and to me it looks like a place you could get some support.
As a dual nationality child I would say the school might see this bullying as being racially motivated and should therefore want to take it very seriously rather than suggesting there is nothing they can do.
'bonne chance'