Indeed, Minhag HaOlam seems to follow this, so this is why people refrain from saying Hashem's Name like it is correctly spelled.
Now the Rambam writes: Yesodei HaTorah 6:2
There are seven names [for G-d]:
a) The name which is written Yud-Hey-Vav-Hey. This is [referred to as G-d's] explicit name and is [also] written Alef-Daled-Nun-Yud.
b) [The name] El;
c) [The name] Elo'ah;
d) [The name] Elohim;
e) [The name] Elohai;
f) [The name] Shaddai;
g) [The name] Tz'vaot;
... and from what I've seen, people are particular to say
Elokim instead of Elo-him and Kel instead of E-l
but what about Shaddai or Tz'vaot?
Do these two names fall into the above cited custom to avoid saying Hashem's name in general conversation?
If so, what is the popular method of mispronouncing these names among those with this custom?