Same address, same person? Telling a duplicate from family

A shared address is the most common reason two profiles look alike, and the least reliable. People who live together, offices and gift orders all put different people at one address. Merging them is permanent, so this playbook helps you decide with the right evidence.

Why an address alone proves little

Partners, flatmates, parents and children, and colleagues at one office all share addresses. A gift buyer can also send an order to a friend’s address, which puts two people at one location.

So treat a shared address as a cue to compare the other details, which is our reasoning and not a rule from Shopify. Shopify’s Help Center says a profile holds one email address, and a person who uses two emails can hold two profiles. Phone number and email are the details that more often belong to one person.

Signals that point to one person

• The same phone number on both profiles. Check that it is not a line shared by people who live together or by an office.
• Emails that look like one address. For example the same name with a typo in the domain.
• The same full name, plus the same address. A common name raises the chance of two people.

Signals that point to two people

• Different first names at the same address.
• Different phone numbers and different emails.
• A shipping address that belongs to the buyer’s friend or relative.
• A business name or a company contact.

A decision table

A made-up example: Two profiles list the same delivery address. Profile A is Jordan Lee with jordan.lee@example.com. Profile B is J. Lee with j.lee@example.com, and both profiles hold the same phone number. A third profile, Sam Lee, has the same address but a different first name, a different email and a different phone number. Worked example (made up) Profiles A and B agree on a phone number and have near-identical emails, so they are probably one person. Sam Lee shares only the address and is probably a family member, so that profile stays apart.

The cost of getting it wrong

Shopify is clear on what a merge does. After profiles are merged, “you can’t reverse the process”. Orders from both profiles appear under the merged profile, and Shopify says “Orders are permanently associated with the customer account that placed them”, so you cannot move one order back. If the customer is subscribed to email and SMS marketing in one profile but not the other, the merged profile is subscribed.

Put together: merging two different people puts one person’s orders on the other’s record, and it can subscribe someone who never agreed. A duplicate you leave for later costs a little tidiness and can be merged next week.

Accuracy cuts both ways

Data protection guidance asks you to keep personal data accurate. The UK regulator’s guidance uses the wording “accurate and, where necessary, kept up to date” and asks that inaccurate data is corrected without delay. A wrong merge makes a record less accurate, and so does a duplicate that splits one person across two. The regulator’s pages do not mention merging, so how this applies to a merge is our reasoning. Laws differ by country, so check your own.

Keeping relatives apart

Relatives, flatmates and gift buyers stay separate customers. Write down why you left a pair apart, so the next review does not open the same question again. Family members explains the term, and the safe merge checklist shows how to mark a group as not a duplicate in MergeGuard.

For the full list of checks before a merge, use the safe merge checklist, and see welcome discount reuse for why a shared address is not proof of misuse.