Husbands name on my caller id

First search your contacts app for his name and that landline number.

If neither are there then it surely has to be the landline phone company.

To test that, have a trusted friend call your landline from their cell phone and see what is on their phone.

Contact your cellular carrier. Caller ID with name is a carrier feature.

If you mean someone else receives your husbands name when you call them, then their contacts may need updating with separate entries for you an your husband.

At the top of your iPhone?

And which phone is calling it?

As KiltedTim says if it is either coming from the provider, which is why I asked if the number was still registered to him, or from the contacts app in the receiving phone, but until you clarify

• What phone is doing the calling
• What phone is receiving the call and getting the ID

I cannot be certain of the situation.

Who's name is on the landline account?

Where is his name appearing, we still have not determined that.

Naturally they must not have added your landline to their contacts yet!