The Wikipedia page also notes that the Octonauts are based on books published in 2006, 2 years before the founding of Github. While I am not a lawyer, I do not

The Wikipedia page also notes that the Octonauts are based on books published in 2006, 2 years before the founding of Github. While I am not a lawyer, I do not think there is very much similarity between the two. Github's Octocat is half-octopus, half-cat. The Octonauts are 8 nautical animals (including an octopus and a cat).