How to run tests by testname in TestNG with maven

I have a maven project, which uses surefire and testng to run automation scripts, my testng looks like this:

<suite name="Suite1">
<test name="foo">
    <parameter name="var" value="${env.name}"/>
    <packages>
        <package name="main.java.automation_scripts.tests"/>
    </packages>
</test>

<test name="bar">
    <classes>
        <class name="main.java.automation_scripts.bar_tests.test.java"/>
    </classes>
</test>

When fire command

mvn clean test -Denv.name=name -Dtestnames="bar" -DsuiteXmlFile=TestNG.xml

it executes all tests in Suite1, I want only those specified by argument to be run, how can I accomplish this?