Rosti

See also: rosti, rösti, Rösti, and roští

Finnish

Possibly from Russian староста (starosta) or from Swedish frost as a byname/nickname.^[1]

Rosti

Inflection of Rosti (Kotus type 5/risti, no gradation)
nominative		Rosti	Rostit
genitive		Rostin	Rostien
partitive		Rostia	Rosteja
illative		Rostiin	Rosteihin
		singular	plural
nominative		Rosti	Rostit
accusative	nom.	Rosti	Rostit
accusative	gen.	Rostin	Rostit
genitive		Rostin	Rostien
partitive		Rostia	Rosteja
inessive		Rostissa	Rosteissa
elative		Rostista	Rosteista
illative		Rostiin	Rosteihin
adessive		Rostilla	Rosteilla
ablative		Rostilta	Rosteilta
allative		Rostille	Rosteille
essive		Rostina	Rosteina
translative		Rostiksi	Rosteiksi
abessive		Rostitta	Rosteitta
instructive		—	Rostein
comitative		See the possessive forms below.

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

first-person singular possessor
		singular	plural
nominative		Rostini	Rostini
accusative	nom.	Rostini	Rostini
accusative	gen.	Rostini	Rostini
genitive		Rostini	Rostieni
partitive		Rostiani	Rostejani
inessive		Rostissani	Rosteissani
elative		Rostistani	Rosteistani
illative		Rostiini	Rosteihini
adessive		Rostillani	Rosteillani
ablative		Rostiltani	Rosteiltani
allative		Rostilleni	Rosteilleni
essive		Rostinani	Rosteinani
translative		Rostikseni	Rosteikseni
abessive		Rostittani	Rosteittani
instructive		—	—
comitative		—	Rosteineni

second-person singular possessor
		singular	plural
nominative		Rostisi	Rostisi
accusative	nom.	Rostisi	Rostisi
accusative	gen.	Rostisi	Rostisi
genitive		Rostisi	Rostiesi
partitive		Rostiasi	Rostejasi
inessive		Rostissasi	Rosteissasi
elative		Rostistasi	Rosteistasi
illative		Rostiisi	Rosteihisi
adessive		Rostillasi	Rosteillasi
ablative		Rostiltasi	Rosteiltasi
allative		Rostillesi	Rosteillesi
essive		Rostinasi	Rosteinasi
translative		Rostiksesi	Rosteiksesi
abessive		Rostittasi	Rosteittasi
instructive		—	—
comitative		—	Rosteinesi

first-person plural possessor
		singular	plural
nominative		Rostimme	Rostimme
accusative	nom.	Rostimme	Rostimme
accusative	gen.	Rostimme	Rostimme
genitive		Rostimme	Rostiemme
partitive		Rostiamme	Rostejamme
inessive		Rostissamme	Rosteissamme
elative		Rostistamme	Rosteistamme
illative		Rostiimme	Rosteihimme
adessive		Rostillamme	Rosteillamme
ablative		Rostiltamme	Rosteiltamme
allative		Rostillemme	Rosteillemme
essive		Rostinamme	Rosteinamme
translative		Rostiksemme	Rosteiksemme
abessive		Rostittamme	Rosteittamme
instructive		—	—
comitative		—	Rosteinemme

second-person plural possessor
		singular	plural
nominative		Rostinne	Rostinne
accusative	nom.	Rostinne	Rostinne
accusative	gen.	Rostinne	Rostinne
genitive		Rostinne	Rostienne
partitive		Rostianne	Rostejanne
inessive		Rostissanne	Rosteissanne
elative		Rostistanne	Rosteistanne
illative		Rostiinne	Rosteihinne
adessive		Rostillanne	Rosteillanne
ablative		Rostiltanne	Rosteiltanne
allative		Rostillenne	Rosteillenne
essive		Rostinanne	Rosteinanne
translative		Rostiksenne	Rosteiksenne
abessive		Rostittanne	Rosteittanne
instructive		—	—
comitative		—	Rosteinenne

Rosti is the 2360^th (tied with 7 other surnames) most common surname in Finland, belonging to 343 individuals, according to February 2023 data from the Digital and Population Data Services Agency of Finland.