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Not entirely necessary - yes!
Google doesn't look it anymore - not entirely correct!
Indeed, after the Penguin and the EMD updates from Google, the importance of keywords in the domain name has decreased, but that doesn't mean they hold no value at all, its just that the value of branding domains increased. If you can still find a domain that has both branding and keyword value - then that is your best bet!
The four things you should consider when choosing your domain name are:
The Human Perspective You want a domain that’s simple to read, simple to say, and simple to remember. It also helps if it’s easy to type.
The Brand Perspective
You’re always going to want people to know what you’re about in the shortest amount of time possible. Domain Extensions
Back in the day there were a handful of choices – .com, .net, .org, etc, and a lot of them had extra extensions depending on what country you were in. Relevance
Just about everyone is looking to rank well in Google to help all those people searching for exactly what your blog provides. If you’ve got a clever and funny blog name but it has no bearing on your actual content, then your URL is not going to be the first few options a searcher sees when they’re looking for what you’ve got.