find user accounts created by bots that have same first and last names and then disable

gistfile1.sql

update users 
  join field_data_field_first_name first ON entity_id = uid 
  join field_data_field_last_name last on last.entity_id = uid 
  SET status = 0 where first.field_first_name_value = last.field_last_name_value;