A named tool for querying structured configuration files. A named tool rather than a concept.
A modern coinage, not an inherited word: built on the model of jq, the JSON command-line processor whose name is commonly read as json + query, with the j swapped for y to name the format it reads instead — YAML.
A command-line tool for querying YAML, built by echoing another tool's shape rather than inventing a new one for the same job. The house keeps tools named for what they do and where they came from, not renamed to sound like a concept of its own.