By default google uses hreflang tags to identify the language in a Blog. The tags are based on codes provided by the International Organization for Standardization - they are not fictitious or imaginative. The URLs of the blogs, in the set, are your choice - the ISO codes, used in the tags, are not your choice.
Here's how you can add a hreflang tag to your blogspot to specify the language of your blog to Google and any other search engines. By using this simple method it can be done easily.
How to Use hreflang for language in Blogger :
Add the following hreflang tag in the header section of your blog/site's template editor, i.e bellow <head> tag and above the closing head tag <head/>
<link rel="alternate" href="http://yoursite-example.com" hreflang="en" />
Replace "yoursite-example.com" with the url of your blog and "en" hreflang tag with the language you want to use. Here are some of the language tags that you can use for other languages.
-------->>>>>> Href Language Tags <<<<<<---------
Additionally if your blog is targeting a specific region, e.g united states ,then you can specify the region also in your hreflang tags by modifying it as shown bellow
<link rel="alternate" href="http://yoursite-example.com" hreflang="en-us" />
us in the above code after the dash (-) represents united states .You can change the region by
Here is a list of region codes on wikipedia --->>>> Href Region codes <<<<---
If your site is multilingual then you can use the following tag in the above code