That's a good question. Ultimately, it all comes down to you, but as mentioned by the other commenters, the double ending 'n' (which is uncommon in English, as far as I know) and the fact that there's an established OSS project with a very similar name would make sure that people don't talk about your project as the "Hugin with two n's" or the "Huginn that's not the photography thing." Google will also helpfully redirect queries for "huginn download" to the other project[3], though that's probably because your project doesn't have many links to it yet.
That being said, they're not in a related area, so I doubt anyone would be excessively confused between both, as opposed to say, Go[1] and Go![2].
What I'd do, personally, is try to find another name and only keep the current project name if I can't find a better one that's not already taken. It makes it easier to rank well on Google and is less likely that someone will apt-get the wrong project.
That being said, they're not in a related area, so I doubt anyone would be excessively confused between both, as opposed to say, Go[1] and Go![2].
What I'd do, personally, is try to find another name and only keep the current project name if I can't find a better one that's not already taken. It makes it easier to rank well on Google and is less likely that someone will apt-get the wrong project.
[1] http://en.wikipedia.org/wiki/Go_(programming_language) [2] http://en.wikipedia.org/wiki/Go!_(programming_language) [3] https://www.google.com/search?q=huginn+download