Name change checklist
The full list of documents and places to update after a legal name change — in the right order, so you don't have to backtrack.

[ ] Update your primary ID first
    Do this first and promptly — many countries fine you for delaying. Every other document below gets updated based on this new ID, so it has to come first.
[ ] Make copies of the marriage certificate
    Keep the original safe and make several certified copies or cloud scans — this is the one document that proves the link between your old and new name everywhere.
[ ] Update your international passport
    Your old passport with any visas in it becomes invalid under the new name — if you have upcoming trips on open visas, plan around them before applying for the new one.
[ ] Update your national insurance record
    The underlying number usually stays the same — only the name on record changes, typically through your employer or government portal.
[ ] Update your health insurance
    A policy under your old name can cause issues at appointments — update it with your insurer as soon as the ID change is done.
[ ] Update your tax ID record
    The number itself doesn't change, only the certificate showing your name — request an updated one from your tax authority.
[ ] Replace your driver's license
    A license under your old name is no longer valid — don't put this off if you plan on driving soon.
[ ] Update your vehicle registration
    Vehicle registration is tied to the owner's name — update it with your local motor vehicle authority once your ID is changed.
[ ] Update your car insurance
    Your car insurance policy is on file under the old name — notify the insurer, otherwise a claim could get complicated.
[ ] Update every bank you use
    Cards, account details, autopay — each bank separately, and a new card can take a few days to arrive. Start with whichever bank runs your recurring bills.
[ ] Notify your employer
    HR needs to update your employment record, and payroll needs the new name for taxes and pay — don't assume they'll find out on their own.
[ ] Leave diplomas and degrees as they are
    These stay in your old name — just attach the marriage certificate (or name change certificate) as proof whenever the document is requested.
[ ] Check any tickets booked under the old name
    Rules vary by airline — some accept the marriage certificate at check-in, others require the ticket reissued in advance. Check with the carrier before travel.
[ ] Check property documents
    No urgent need to reissue anything — ownership is backed by the marriage or name-change certificate. But expect it to come up at your next sale or transaction.
[ ] Update subscriptions, deliveries and accounts
    Delivery recipient names, accounts tied to your legal name, messaging apps, loyalty programs — small things, but there are a lot of them, so go through them as a list.
[ ] Reissue any powers of attorney
    A power of attorney under your old name can be challenged or rejected — reissue any that are still in use.

Checklist from Unload: https://unloads.me/c/name-change-documents