the.com/head boy

means The senior boy appointed to lead and represent fellow pupils at a school, typically chosen for exemplary conduct, academic standing, or leadership shown over their time there.

from A straightforward English compound — 'head' in its long-established sense of 'chief' or 'topmost in rank' (as in headmaster, head of state), plus 'boy.' The role grew out of British school prefect systems, where older pupils were given authority over younger ones to help staff enforce order; 'head boy' simply named the one standing at the top of that pupil hierarchy, with 'head girl' following once schools educated both.