1)
What connotations of "Vayikra be'Shem Hashem"?
1.
Rashi (citing Targum Onkelos) and Targum Yonasan: It means that Moshe called out in the Name of Hashem.
2.
Rashbam: It means that Hashem called out (as He passed Moshe) by His Name. 1
3.
Seforno: Hashem, mentioned earlier in the Pasuk, called out the Name of Hashem (His Divine Attributes).
4.
Da'as Zekenim and Hadar Zekenim (in 33:21): It means that Hashem informed him with which name He will go with him (in the desert).
1
As He told Moshe earlier - See 33:19 (Rashbam).
2)
What is the meaning of "va'Yisyatzev Imo Sham"?