Spam and/or phishing attempts are not 'precisely targetted', they are sent out to millions of email addresses in the hope that a few will respond.
The spammers or phishers either buy lists of email addresses or they use harvesting programmes to syphon email addresses from websites etc.
I get loads of phishing attempts every day from just about every bank name imagineable. Obviously some of them will be using the name of my actual bank.
If you have an email address that uses your name (eg
[email protected]) the phishers will often start by addressing you as Dear John Smith. Its not rocket science but it's designed to look convincing and to fool you.
It is highly improbable that any of the spam or phishing is a result of anyone having any detail other than your email address which could have been obtained from anywhere.