The Fields Translations tab under Settings > General Settings lets you edit lead field names as you prefer.
On the Fields Translations tab, you will find the list of lead field names used in the Dialer.
To change the lead field name displayed:
Click the Edit button under Actions.
Set a new field name in the Translation field on the page that opens.
Click Save.
The new field name will now update on all the pages where lead details are displayed.
You still can see the original name as a tooltip if you hover over the field name.
