Well I like it and think people who have a problem with it are generally conformist miserable fuckers! I've meet loads of kids lately with 'out there' names from working and middle class backgrounds. The 'try hard' label says as much about those judging you as it does about you.
Hendrix is a cool name. So what if its named after a rock star. Being named after someone is one of the most popular sources of new names - something that's gone on for thousands of years. All names start from somewhere. They don't have to have 200 years of provenience to be 'real names'.
I was very amused by an article that British Baby Names Blog found from the 1940s last month, which went on about how it was good that WWII had not inspired any awful unusual names like WWI had, and how good it was that people were using 'sensible names' instead. Given that we are currently celebrating and reusing names that were popular 100 years ago, I find the repeating of this trend today quite ironic.
It you like Hendrix, and it means something to you, go for it. Don't worry what other people think because ultimately someone will always have a comment regardless of whether you go for the No1 name of the day or the most outlandish thing imaginable.
The only except I make to that, is to try to avoid names with rude nicknames or bad/negatives associations. Being unusual alone won't single a kid out for bullying when there are so many other unusual names out there now.