Name Change

The possuk in Zecharyah (14:9) says וְהָיָ֧ה י״י֛ לְמֶ֖לֶךְ עַל־כׇּל־הָאָ֑רֶץ בַּיּ֣וֹם הַה֗וּא יִהְיֶ֧ה י״י֛ אֶחָ֖ד וּשְׁמ֥וֹ אֶחָֽד.  The Arizal says that the possuk is telling us in the future שמו אחד means the name of Hashem will not be יקוק but יקיק.  He explains this according to the kabbalah of what the letters mean.  I would like to explain this idea in a different vein based upon Rabbenu Bechai.  At the end of Beshlach on the words כי יד על כס קה, the Bechai says that the יק in the name of Hashem is the middat hadin.  The וק is the middat harachamim to sweeten the din.  

The Kli Yakar in Ke Savo (27:12) cites this Bechai and uses it to explain why the tochacha starts with a ו and ends with a ה and why there are 11 אררורים mentioned.  The tochacha is wrapped in the letters of rachamim and the gematria of those letters make up the number of אררורים to demonstrate that even the curses are wrapped in rachamim.  

In light of this we can say now the name of Hashem is a mixture of din and rachamim because the world can't exist with just din.  However, in the future days, when the world will be perfected things will go back to the "original plan" and there will only be middat hadin.