It’s common practice for friends of the ruling political party to donate $300,000 (the minimum) or more to the party and then be named as an okhna (aka rich-person-sucking-up-to-the-government). You can prefix the title whenever you write your name so everyone will know you’re rich.
Mr. KONG SOM OL went a bit further (probably gave more money) and got Blvd 2004 named after himself. After paying all that money, you don’t want to waste any of the glory so he had his whole title prefixed to his name. It makes for a useless street sign in English but this whole thing isn’t about being useful.