[Solved]-Highcharts Highstock How do I change the label on top of tooltip for OHLC series data?-Highcharts

Set name for the series, disable firstRowAsNames property and set startRow to 1 in data options:

    data: {
        firstRowAsNames: false,
        startRow: 1,
        ...
    },
    series: [{
        name: 'Adjust',
        ...
    }]

Live demo: http://jsfiddle.net/BlackLabel/fkh0oa2s/

API Reference:

https://api.highcharts.com/highstock/data

https://api.highcharts.com/highstock/series.ohlc.data