Guide

1. Inside your Microsoft Excel worksheet, find and select the entire column containing the list of names you wish to split.

2. After that, head over to the top menu bar and click 'Data'.

3. Choose 'Split Text to Columns' from the given options.

4. Following that, specify the delimiter you use between the first and last names.

5. Check the results from the provided preview and then tap 'Apply' to save the changes.

6. After completing these steps, the first and last names from the selected list will be separated into two columns.