三人
さんにん
sannin
= three people
三人 (sannin) is the standard Japanese word for a group of exactly three people, used constantly in daily life — from booking a restaurant table to describing a family or team.
三人 (sannin) means “three people” and follows the regular -nin counter pattern used for counting people in Japanese. From three onward, the pattern is predictable: sannin (3), yonin (4), gonin (5), rokunin (6), and so on. The first two numbers are a notable exception — one person is hitori (一人) and two people is futari (二人), both irregular forms inherited from classical Japanese. Once you pass two, the counter snaps into the regular -nin pattern without further exceptions. Sannin is used in neutral, factual contexts regardless of formality level.
The most common mistake learners make is applying the irregular hitori/futari pattern beyond two people. Remember: the irregularity stops at two. From sannin onward, just attach the number’s on-reading to -nin with no surprises. Also note that yonin uses yo- (not shi-) and shichinin uses shichi- for seven — these are the only small quirks in the otherwise regular series.
三人 combines two kanji: 三 (san), meaning “three,” which depicts three horizontal strokes — a simple pictographic count; and 人 (nin / hito), meaning “person,” depicted as a figure with two legs. When 人 functions as a counter suffix it is read -nin, though it shifts to -ri in the irregular forms hitori and futari.
Everyday use
予約は三人でお願いします。
Yoyaku wa sannin de onegaishimasu.
I’d like to make a reservation for three people.
Casual / Social Media
今夜のご飯、三人で食べに行かない？
Konya no gohan, sannin de tabe ni ikanai?
Want the three of us to go out for dinner tonight?
Formal / Cultural context
本プロジェクトは三人のチームで担当いたします。
Hon purojekuto wa sannin no chiimu de tantou itashimasu.
This project will be handled by a team of three.
Three-person groupings carry a quiet significance in Japanese daily life. The phrase sannin yoreba monju no chie (三人寄れば文殊の知恵) — roughly “three heads are better than one” — reflects a cultural value placed on small collaborative groups. The specific number three is invoked rather than a vague “several,” and sannin is the word that makes that precision possible.
In traditional performing arts such as Bunraku puppet theatre, a single puppet is operated by exactly sannin — three puppeteers working in silent coordination. The lead puppeteer controls the head and right arm, a second handles the left arm, and a third manages the legs. This three-person structure is considered the minimum needed for lifelike movement, and the word sannin is central to how this craft is taught and described.