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You ask Claude to send one message from support@ and another from contracts@. Both go out from the right address, and both arrive looking like this:
The addresses are different. The name is not, so at a glance the two are indistinguishable.

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Why

Gmail stores a display name for each sending address, and nothing makes them different from one another. When you attach a domain to a Gmail account, each address you add starts out carrying the name already on the account. Unless you have changed one since, they all say the same thing. That is what a recipient sees first. The address is in there, but it is the name their mail app puts in bold.

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Change it in Gmail

The name lives in Gmail’s settings, not in the hub, so this is where you set it. You need a computer; the mobile app has no screen for it.
1

Open the settings

In Gmail, click the gear icon, then See all settings.
2

Go to Accounts

Open the Accounts and Import tab. On some accounts it is labelled just Accounts.
3

Find the address

Under Send mail as, each address you can send from is listed. Click edit info beside the one you want to change.
4

Set the name and save

Enter the name you want recipients to see, then Save changes.
Google’s own instructions: Change the name on your Gmail account and Send emails from a different address or alias.
Do this once for every address you send from. Changing one leaves the rest exactly as they were, which is easy to miss when the whole reason you looked was that they all matched.

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Afterwards

The hub asks Google what a given address is called every time it sends, so there is nothing on this side to refresh, restart, or wait for. Send a message to yourself and look at what arrives. If it still shows the old name, the change has not taken effect at Google yet rather than being held anywhere here.

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What you cannot do

Gmail allows one name per address. The same address cannot send as one name today and another tomorrow. If you need two names, they need two addresses.

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