previous owners name still on purchased Mac after a. year. Is my personal a data jeopardized?

itsApple909 wrote:

I bought a used Mac roughly a year ago. I was told the previous owner (my buddies ex) had erased all her data. Later after getting home and digging into it. I. seen her name still appeared. I contacted them and informed them. They. said she followed all the directions etc.. But she. would check into it and handle immediately once they got home. That turned into once she got to work where she has an Apple device to use, "because its so much simpler to do on an Apple devise." DOES SHE. HAVE. ACCESS TO ALL MY DATA AT WILL & WHAT CAN I DO?

It does not sound like it was properly prepared...

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