Do Any Elves Survive Helms Deep?

In Tolkien's account, there were no Elves at Helm's Deep (aside from Legolas), and the Elves of Lórien were occupied in battles against forces out of Moria and Dol Guldur, which were only mentioned in passing.

How many Elves survive Helms Deep?

There was around 500 Elves at Helm's Deep and the only Elf left at the end of the battle was Legolas.

Why were the Elves at helm deep?

To ensure that the The Two Towers movie got across the message that Saruman was a threat to all the peoples of Middle-earth and not just its men, the decision was made by Jackson and others to incorporate the elves into the Helm's Deep battle rather than have them scrapping off-screen in a different location.