The Ashkenazi leining for the end of an aliya generally has a drop of 4 tones. In my preferred key, that's from D to A (hit
e on this virtual piano). However, some baalei kriah in my shul do not do this when the last word of the aliya is Hashem's name, and instead drop only a single tone (D to C, hit
t on that piano).
I would guess that the reason for this is some notion of respect, where they don't want to make such a drop on His name.
Is there any basis in halacha or firmly established minhag for this, or is it merely a personal quirk of a few people?