〜人
counter for people
一人 (ひとり), 二人 (ふたり), 三人 (さんにん) …
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People are counted with 人. The first two are irregular and the rest are regular:
ひとり, ふたり, さんにん, よにん, ごにん, ろくにん, しちにん or ななにん, はちにん, きゅうにん, じゅうにん. "How many people?" is 何人 (なんにん).
Watch 四人: it's よにん, not よんにん.
一人で means "on your own": 一人で行きました, "I went alone". 二人で is "the two of us".
In restaurants you'll be asked 何名様ですか; 名 is the polite counter for people, and you can answer with 二人です. Holding up fingers works too, and staff do it back.
Examples
家族は四人です。
There are four of us in my family.
兄が二人います。
I have two older brothers.
一人で映画を見に行きました。
I went to see a film on my own.
教室に学生が五人います。
There are five students in the classroom.
クラスに学生は何人いますか。
How many students are in the class?