definite articles - "The" with labelled nouns

Practical English Usage 142.20 reads

We usually leave out articles in abbreviated styles:

numbering and labelling

• Go through door A



• Control to Car 27: can you hear me?


• Turn to page 26.

What can be considered labels? For example, "on page 10" and "in Chapter 2" are clear. But do the following need "the"?

• The/_ name 'John' is popular.


• We suggest use the/_ method Y...



• ...as the/_ variable x grows...


• The/_ words "evokeo cvec" do not mean anything.

In other words, can "the" be omitted in every noun + its label/name phrase?