How can I change Contact Names in bulk

[Kevin_Gallagher]

Hi All, we uploaded a list into Marketo and noticed a lot of the names are all capitals. I went ahead and changed them and re-uploaded the list. However, everything stayed the same. My assumption is that it already created a contact for that person. Is there a way to change this in bulk?

Thanks!

[Vladislav_Vagn1]

When you reuploaded, did you do it as "trusted"?
Do you have field updates blocked for list imports for the first and last name field?