Potential nicknames: Issie, Lala, Isle, Isles, Islie (pronounced eye-lee)
Origin: (1) Scottish and English, meaning "Scottish island," derived from Islay, the real name of a Scottish island. It is also the name of two Scottish rivers. It became a popular given name in the 1800s.(2) Old French, from the name Ila, meaning "island."
Popularity: In 1886 Isla ranked at #938 on the SSA's top 1000 list, climbing to #713 the next year, sinking a little in the following years, and then it fell off the chart after 1908. Then in 2008, possibly due to actress Isla Fisher, the name jumped back on the chart, landing at #619, and increasing ever since. In 2010 it was at #297 and in 2011 it reached its highest ranking at #268. In the UK she has already made it in the top 100, and she's popular in many countries.
Fun fact: Isla Fisher, actress, married to Sasha Baron Cohen, who named her baby girls Elula Lottie Miriam Cohen and Olive (middle name unknown).