The origin of title 007 is well documented and not complicated.
00 is because MI7 agents use numbers as contact addresses, but not all of them start with 0, long or short, and everything. Ian fleming, the original author of 007 series, is a European. He likes 7-up as much as all Europeans. In order to highlight 7 and make it easy to remember, two zeros were added in front of 7. So we have 007!
Do you know the "Seven Conspiracy" of Europeans? Most of them like it because they think 7 means luck and magic. For example, the seven dwarfs, seven-color flowers, seven-color sunshine, and even the seven fairies in China, are all what they call seven. Boeing 707 just because they like seven, and the patent number happens to be 707, so they took it as the name of this model. It is obvious that westerners like seven.