why don't we call 【east london】 instead of 【east end of london】，what's "end of " for?

I'm in the US, and I'm not familiar with London geography or speech, but these are apparently used in different situations, for example:

He's an East London boy. (Not: "an East End of London boy." The reason is apparently for euphony, that is, better rhythm.)

He's from the East End of London. (Not "from East London." Again, the reason is apparently euphony.)

Please put your question in the text box. Don't put the entire question in the title.

The East End is the name of the region within London. That's just its name.

CJ

so ,name is just name?
About not to put question in title,advise accepted. i am new here,i didn't notice it has a bug to show entire sentense in home page.

Place one or two words in the header. Choose something that describes your question in general. For example, you could have written "East End" in the header.

Then ask your question in the text box.
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Yes, the East End is the name of a part of London. It's not really the end of anything. "end" is sometimes used to mean "district".