Really old bookmarks somehow on my iPhone 4?

Alright so the other night I found on my iPhone safari a whole bunch of these bookmarked sites that were all from my girlfriends old laptop, but she got rid of her laptop like over two years ago and I got my phone a year ago. She's promised none of the sites there she looked up or bookmarked, so does anyone know how they possibly could be on my phone! Some sort of auto sync some how? I have absolutely no clue how they got there, answers please?

Sometimes my I phone auto sinks but if you want to delete it go to safari click on the book icon and clear history then go to settings, safari and clear history

If on google pull up google by actualy searching google on safari then press on bar and there will be things you typed in and press clear history below them highlighted in purple and do it till all gone

Hope I helped