Bob the Jagex Cat is commonly known as Jagex's cat. In actual fact although they made him into a character called "Bob the Jagex Cat" on RuneScape in real life Bob's name is not Bob, Bob's real name is unknown to the public. The actual name Bob was given to him by his creator "Mod Bob C". Although for quite a while he was just called Cat and wandered round aimlessly.
In RuneScape Bob is an NPC who randomly wonders round. He has a girlfriend called Neite who sometimes can be seen with him. Bob is also thought to be the father of all player-owned cats in RuneScape and heavily features in a quest called "A Tail of Two Cats". In this quest we learn he is a reincarnation of a brave warrior called Robert the Strong. After the quest he can be located using the catspeak amulet (e), which is otherwise very hard to do due to his large wander area. It is also believed he is a reincarnation of Zaros (a god in the RuneScape universe) because of certain quotes like "You can destroy Zamorak. He has foreseen this. It is your destiny. Join me, and together we can rule this place as father and son." as Zaros wants to kill Zamorak (because Zamorak betrayed him) and at one point he says "Well I don’t believe much really since I know I am Zar... erm, well, no, I erm, meow?" which also hints at the fact that he may be Zaros. He also claims to be leader of all humans and lets Andrew Gower think he's in charge when really he's not.