That depends actually. Currently there have been 5 mainstream Robins.
The first was Dick Grayson. though he grew up and adopted the name Nightwing. After it was believed that Bruce Wayne was Dead, he became Batman. When Bruce returned he started going around the world and finding people who believes are worthy to become the Batman for their Area. So Dick is now the Batman of Gotham.
The next Robin was Jason Todd. Jason was killed by the Joker years ago, but has recently been revived by being dipped into a lazarous pit. Although those pits do restore life, they also affect you mentally. Jason has been acting evil and has fought against the bat family several times since being brought back to life.
Next is Tim Wayne (formerly Tim Drake) was the 3rd robin. Tim was able to deduce Batman and Robin's identity. After Jason died he came to believe that Batman needs a robin, so set out to prove to batman he should get the role. When Dick became batman he decided that Tim was his equal and should not be his sidekick. Tim felt hurt by this and the fact that no one would believe him when he said that Bruce was still alive. So he left Gotham for a while adopted the name Red Robin to prove Bruce was alive. it nearly cost him his life but he did end up proving it.
The Fourth Robin was Stephanie Brown, Tim's exgirlfriend who previously went by the name Spoiler. When Tim is temporarly forced to resign his role as robin, Stephanie demends that batman train her to be robin. After several months of training she officially takes on the role of robin and patrols with batman, but is fired when she disobeys him on two missions. though she was believed dead for a time, she returns and is the current batgirl.
Finally, the current Robin is Damian Wayne. Damian is the Son of Bruce & Talia al Ghul who drugged him to sleep with him and get herself pregnant. he was raised by his mother and the league of assassins. she had planned to use him against him, but he ended up deciding to stay with him. After Bruce was thought dead Dick asked him to become his robin.
also there was also a robin in the non-canonical graphic novel the dark knight returns named Carrie Kelly. in this world where batman retired from crime fighting. she eventually saves batman and is accepted as robin. in the sequel she goes by the name cat-girl but is still batman's second in command.
So it really depends on which robin you mean. most tv movies/shows/Cartoons usually revert to Dick greyson, although Tim drake has also been used several times as well. the short lived tv series Birds of Prey make mention to both dick, Jason and Tim though the show was canceled before any had a chance to make an appearance.
Batman's real name is Bruce Wayne
Batman's alter ego is practically his identity which covers him being Batman. His alter ego is Bruce Wayne.
Biologically Speaking of so far I know Bruce Wayne, The Batman, have a child from Tali Al Ghul by the name of Damian Wayne and One from Selina Kyle, The Cat Women, by the name of Helena Wayne. Adopted would be Richard Grayson, Timothy Drake, and Cassandra Cain. So that equals five all together.....yeah I know math!
While it is never explicitly stated, there are several clues pointing to his last name being "Grayson".
Lewis Wilson play Batman in the first Batma n serial movie in 1933. Then Robert Lowery in 1939 in Batman and Robin : Relentless Crusaders for Justice!it was the year 1943 in which Lewis Wilson frist played the role of Batman in the first 15 serials. and 1949 in which Robert lowery played Batman in the second set of 15 serials.Unless you're talking purely about the comics continuity, in which case there's a sort of trick answer. Bruce Wayne's father, Thomas Wayne, dressed up like a "Bat-Man" for a costume party when Bruce was a little boy (he still has the costume), but Bruce himself was the first person to use a Batman persona to fight crime. When Bane broke Batman's back, Azreal breifly was Batman.
Bruce Wayne(Billionaire Bruce Wayne)Originally, billionaire Bruce Wayne was the Batman, but after Wayne disappeared, Dick Grayson, the first Robin, took up the mantle of Batman.
Bruce Wayne
Batman's real name is Bruce Wayne
When not in cape and cowl, he is Bruce Wayne, a billionaire and industrialist that owns Wayne Enterprises.
Bruce Wayne is the name of the dude who crusades as Batman.
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Batman's name is Batman. However his secret identity is Bruce Wayne.
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Bruce Wayne
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Bruce Wayne