Escaping double curly braces inside a markdown code block in Jekyll

You're looking for the {% raw %} tag.

{% raw %}
Hello, my name is {{name}}.
{% endraw %}

You can use {% raw %} to ensure content is unmodified by Jekyll:

{% raw %}
This is inserted literally: {{foo}}
{% endraw %}

However, note that this is not a code block. You will need additional code formatting to make your content render as code:

{% raw %}
    I'm a code block, because I'm indented by 4 spaces
{% endraw %}

{% raw %}
```handlebars
I'm a code block that contains {{handlebars}}
with highlighting.
```
{% endraw %}

For future references: using plain {% raw %} and {% endraw %} is only the second best solution since those are shown if you look up the Markdown on normal github.com.

The best way is to put {% raw %} and {% endraw %} in HTML comments:

<!-- {% raw %} -->
something with curlky brackets like { this } and { that }
<!-- {% endraw %} -->

Due to the HTML comments it is seen by Github as a comment. In Github pages the raw tags will prevent the parsing of the curly brackets in between the tags.

With jekyll the code is:

{% highlight html%}
{% raw %}
     <h2> {{ user.name.first | uppercase }}</h2>
     <p> {{ user.email }}</p>
{% endraw %}
{% endhighlight %}