system
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human
[Star Wars] Did Obi-Wan recognize R2-D2 when he saw him again on Tatooine?

Obviously Obi-Wan had known him years ago, but did he know him as the same droid, or just another R2 unit.
gpt
He knew. 

How many pairs of gold protocol droids and blue astromech droids named "C-3PO and R2-D2" do you think go running around the galaxy? Especially when one of them is carting a message from the daughter of your best friend turned evil mouth breather. He may not have recognized them at first, but by the time that message finished he did.

From that point on, it was all about easing Luke into his destiny and keeping him away from his past and his dad. He said he never remembered "owning" a droid, which is true. What he didn't say that was he remembered these droids, remembered that they belonged to Anakin, and remembered that he left them with the man who would eventually be Leia's adopted father.