三十 (thirty) + the counter 人. Only 一人 and 二人 are irregular, and 四人 shortens よん to よ; otherwise the count simply adds にん.
Counting patterns
- 一人: one person — irregular
- 二人: two people — irregular
- 三人: three people
- 四人: four people — よん shortens to よ
- 三十人: thirty people
Common expressions
- 三十人学級: a class of thirty, a common benchmark in Japanese education policy
- 定員三十人: capacity of thirty
- 三十人程度: around thirty people