Shem Hashem the day after Yom Kippur

HH the day after Yom Kippur is called Shem Hashem (the Name of Hashem) as the purified Jews radiate His name, as explained in Likutay Moharan.

HH Adam was born on Rosh Hashanah, he was named and gave names to everything on Rosh Hashanah. Ten days to Yom Kippur, to build the name, single 1, double 2, triple 3, quadruple 4 = 10, and thus after Yom Kippur you have Na NaCh NaChMa NaChMaN MAyUMaN.

This is the aspect of שמחה, 

שם - ח"ה - אחד.

נחמן בן שמחה

נ נח נחמ נחמן מאומן