As far as I am aware, you can only change a Sim's name in Sim creation mode, which you can get to either during Sim creation or by going to a mirror and selecting the option to change your appearance. 🙂
This only allows to change the names of the Sims in the active Household, to change your neighbors you'd have to switch Households.
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About The Sims 4 Technical Issues - PC
PC players get help with their technical issues in The Sims 4 here.52,836 PostsLatest Activity: 2 hours ago