Here's an idea. PLEASE NOTE: This is just a random idea of mine; I have not tried it, do not know if it would work, and cannot say whether it would do more good than harm!
You should be able to export your Google/Gmail contacts to a .csv file: in Gmail on your computer (in a browser), click on the down arrow next to "Gmail" and select Contacts; then click the More button and select Export.... Save the .csv file somewhere handy, then open it in Excel or another program that can edit .csv files. See if you can select and swap the contents of the first-name and last-name columns (leaving the column headers in place). If that works, then you could save the file under a different name, go back into Gmail, take a deep breath, write out your will, remove all sharp objects from your house, etc.; and then delete your contacts and import the new file with the swapped columns. If it works, you're good. If not, you can delete the imported items and re-import the original ones you exported. You might even want to start by exporting 2 or 3 different copies, to make sure you've got one to go back to.
I repeat, I have not tried this and don't know how well it would work or what it might mess up. I wouldn't recommend doing it unless you're well experienced with using Gmail Contacts, Excel, and computers generally, and are basically a courageous, risk-taking kind of person. I take no responsibility for whether it works or not.
