Lassi

See also: lassi

Finnish

Etymology

Medieval diminutive form of Lauri (“Laurence”).

Pronunciation

• IPA^(key): /ˈlɑsːi/, [ˈlɑ̝s̠ːi]
• Rhymes: -ɑsːi
• Syllabification^(key): Las‧si
• Hyphenation^(key): Las‧si

Proper noun

Lassi

1. a male given name
   • 1922, Anni Swan, Pikkupappilassa, WSOY, published 1966, page 142:

     Lotti tenäsi koreita nimiä vastaan, ne olivat niin vaikeat lausua. Ja hänen paperinukkensa eivät olleet mitään ruhtinattaria tai sotapäälliköitä, ne olivat hänen omia pikkulapsiaan ja niillä piti olla pikkulasten nimet. Maija ja Kerttu ja Lassi ja Lilli.

     Lotti argued against overly flowery names, since they were so hard to pronounce. Her paper dolls were no princesses or warlords; they were her own children and they needed children's names. Maija and Kerttu and Lassi and Lilli.

2. a Finnish surname transferred from the given name

Declension

Inflection of Lassi (Kotus type 5/risti, no gradation)
nominative		Lassi	Lassit
genitive		Lassin	Lassien
partitive		Lassia	Lasseja
illative		Lassiin	Lasseihin
		singular	plural
nominative		Lassi	Lassit
accusative	nom.	Lassi	Lassit
	gen.	Lassin
genitive		Lassin	Lassien
partitive		Lassia	Lasseja
inessive		Lassissa	Lasseissa
elative		Lassista	Lasseista
illative		Lassiin	Lasseihin
adessive		Lassilla	Lasseilla
ablative		Lassilta	Lasseilta
allative		Lassille	Lasseille
essive		Lassina	Lasseina
translative		Lassiksi	Lasseiksi
abessive		Lassitta	Lasseitta
instructive		—	Lassein
comitative		See the possessive forms below.

Possessive forms of Lassi (Kotus type 5/risti, no gradation)

first-person singular possessor singular plural nominative Lassini Lassini accusative nom. Lassini Lassini gen. Lassini genitive Lassini Lassieni partitive Lassiani Lassejani inessive Lassissani Lasseissani elative Lassistani Lasseistani illative Lassiini Lasseihini adessive Lassillani Lasseillani ablative Lassiltani Lasseiltani allative Lassilleni Lasseilleni essive Lassinani Lasseinani translative Lassikseni Lasseikseni abessive Lassittani Lasseittani instructive — — comitative — Lasseineni second-person singular possessor singular plural nominative Lassisi Lassisi accusative nom. Lassisi Lassisi gen. Lassisi genitive Lassisi Lassiesi partitive Lassiasi Lassejasi inessive Lassissasi Lasseissasi elative Lassistasi Lasseistasi illative Lassiisi Lasseihisi adessive Lassillasi Lasseillasi ablative Lassiltasi Lasseiltasi allative Lassillesi Lasseillesi essive Lassinasi Lasseinasi translative Lassiksesi Lasseiksesi abessive Lassittasi Lasseittasi instructive — — comitative — Lasseinesi first-person plural possessor singular plural nominative Lassimme Lassimme accusative nom. Lassimme Lassimme gen. Lassimme genitive Lassimme Lassiemme partitive Lassiamme Lassejamme inessive Lassissamme Lasseissamme elative Lassistamme Lasseistamme illative Lassiimme Lasseihimme adessive Lassillamme Lasseillamme ablative Lassiltamme Lasseiltamme allative Lassillemme Lasseillemme essive Lassinamme Lasseinamme translative Lassiksemme Lasseiksemme abessive Lassittamme Lasseittamme instructive — — comitative — Lasseinemme second-person plural possessor singular plural nominative Lassinne Lassinne accusative nom. Lassinne Lassinne gen. Lassinne genitive Lassinne Lassienne partitive Lassianne Lassejanne inessive Lassissanne Lasseissanne elative Lassistanne Lasseistanne illative Lassiinne Lasseihinne adessive Lassillanne Lasseillanne ablative Lassiltanne Lasseiltanne allative Lassillenne Lasseillenne essive Lassinanne Lasseinanne translative Lassiksenne Lasseiksenne abessive Lassittanne Lasseittanne instructive — — comitative — Lasseinenne third-person possessor singular plural nominative Lassinsa Lassinsa accusative nom. Lassinsa Lassinsa gen. Lassinsa genitive Lassinsa Lassiensa partitive Lassiaan Lassiansa Lassejaan Lassejansa inessive Lassissaan Lassissansa Lasseissaan Lasseissansa elative Lassistaan Lassistansa Lasseistaan Lasseistansa illative Lassiinsa Lasseihinsa adessive Lassillaan Lassillansa Lasseillaan Lasseillansa ablative Lassiltaan Lassiltansa Lasseiltaan Lasseiltansa allative Lassilleen Lassillensa Lasseilleen Lasseillensa essive Lassinaan Lassinansa Lasseinaan Lasseinansa translative Lassikseen Lassiksensa Lasseikseen Lasseiksensa abessive Lassittaan Lassittansa Lasseittaan Lasseittansa instructive — — comitative — Lasseineen Lasseinensa

Derived terms

• Lassila

compounds

• Matinlassi

Related terms

• (surnames) Lassila

Statistics

• Lassi is the 127^th most common male given name in Finland, belonging to 4,943 male individuals (and as a middle name to 818 more), according to August 2025 data from the Digital and Population Data Services Agency of Finland.
• The surname Lassi belongs to 141 individuals, according to August 2025 data from the Digital and Population Data Services Agency of Finland.

Anagrams

• silsa, sisal