Leo

We've almost settled on your name:

Leo Lachlan Philemon Fullagar 

 Leo is both a cute name as well as a strong one with a some significant cultural namesakes:

Leonardo Da Vinci
 Leonardo di ser Piero da Vinci was an Italian Renaissance polymath: painter, sculptor, architect, musician, scientist, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist, and writer.

Leo Tolstoy 
Tolstoy a Russian writer of the last 1800's is considered by many have been one of the world's greatest novelists. He was a noted moral thinker and social reformer.

And of course, Leo comes from the Latin meaning lion!