Why is his name first in the search bar in Facebook?

[princess sweety]

Okay , i 'unfriended' a guy called Oliver Montague (fictitious name) in Facebook months ago, on January precisely. However recently (two days ago) when i type 'O'(1st letter of his name) in the search bar above, his name came first! Why is this so? We never contacted each other after that 'unfriend'.
A friend told me that he might have checked my profile a couple of time. Do you agree? :/

[RG]

While you were on Facebook at one time you probably Googled the name. It popped up 1st because you probably never Googled a name starting with "O" before. There is no conspiracy.