In fact, it's still morning in England, but 'Good evening' to you anyway, Choco!

It's not clear what you mean by an 'available' English name. Do you mean 'suitable'? Well, it's not a 'real' name, as such, but I think it's probably fine as a nickname or cybername. It's the first part of the word 'chocolate', so it sounds like a name a clown might have, or a chocolate-brown cat or dog. It depends on the type of person you are. If you want people to think of you as a serious intellectual, then maybe 'Choco' doesn't give the right impression. But if you're fun and friendy - like a clown or a puppy - it sounds fine to me.

Just one concern...an internet search tells me that 'Choco' is racist Australian slang for dark-skinned person. You might want to wait for an Australian member to tell you whether this is a problem or not.

Well, it looks like you already have an answer. If Peachey from Australia doesn't see a problem with the 'Choco', then that's fine. It's a cute and funny nickname.

Su.Ki.

Why on earth did I assume he was female?  Oh dear! A thousand apologies! 

As the OP seems to be a man, I doubt that being called that Elizabeth or Margaret would help his career prospects very much!

As you probably know, English names aren't meaningful in the way that Chinese ones are. We choose names according to personal taste and fashion, the general sound of the word, and certain cultural and social connotations. If you want an English name that you can also use in the workplace, you should choose a standard given name rather than a funny nickname.

Would you like to tell us your Chinese name, and how it's pronounced? If you like, we could suggest an English name that sounds similar.