I too love the name Talullah and always have. I considered it for my first DD because both my husband and I adored the name. In the end, I dismissed it for many of the reasons you mentioned. I do think some people perceive it as 'now' name or one used by people trying to be hip. Having said that, I think it's hard to avoid names that are considered 'hipster' these days. We ended up naming our daughter
Scarlett and I know it has the same issues. In the end, I think you should pick a name you love and ignore those who might comment negatively- any name that is not in the top 50 can be considered 'try hard' and I find that looking at these name boards just often makes you feel worse- It's impossible to predict if some celebrity might name their child a name, thereby making it's popularity rise etc....if we avoided every name either held by a celebrity or used by a celebrity, we wouldn't be left with very many choices:)
As for the spelling, I prefer Talullah as it is of Irish origin which is my background- it appeals to me more for this reason- I love the nickname
Lulu!!!!