Ballerina

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Ballerina is a cloud-native programming language designed for building microservices and distributed systems. It focuses on ease of use, scalability, and resilience, allowing developers to create and connect services efficiently.

Hello, world:

import ballerina/io; 

public function main() {
    io:println("Hello World!"); 
}

Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.