Is there a way to disable "use safari suggested password" shown below, without disabling autofill? 
MacOS – Disable `use safari suggested password` without disabling autofill
macospasswordsafari
Related Solutions
It will default to the first email address in the list, so put the one you want to use for autofill first in your address book and it will then use that one.
If AutoFill is disabled, Safari won't ask to save passwords either.
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Best Answer
The correct answer is: there is no way to disable the suggested passwords "feature" without completely disabling auto-fill.