Kosamo

Finnish

Possibly from a Karelian name Kosa (perhaps from Russian коза́ (kozá, “goat”)) +‎ -mo.^[1]

Kosamo

Inflection of Kosamo (Kotus type 2/palvelu, no gradation)
nominative		Kosamo	Kosamot
genitive		Kosamon	Kosamojen Kosamoiden Kosamoitten
partitive		Kosamoa	Kosamoja Kosamoita
illative		Kosamoon	Kosamoihin
		singular	plural
nominative		Kosamo	Kosamot
accusative	nom.	Kosamo	Kosamot
accusative	gen.	Kosamon	Kosamot
genitive		Kosamon	Kosamojen Kosamoiden Kosamoitten
partitive		Kosamoa	Kosamoja Kosamoita
inessive		Kosamossa	Kosamoissa
elative		Kosamosta	Kosamoista
illative		Kosamoon	Kosamoihin
adessive		Kosamolla	Kosamoilla
ablative		Kosamolta	Kosamoilta
allative		Kosamolle	Kosamoille
essive		Kosamona	Kosamoina
translative		Kosamoksi	Kosamoiksi
abessive		Kosamotta	Kosamoitta
instructive		—	Kosamoin
comitative		See the possessive forms below.

Possessive forms of Kosamo (Kotus type 2/palvelu, no gradation)

first-person singular possessor
		singular	plural
nominative		Kosamoni	Kosamoni
accusative	nom.	Kosamoni	Kosamoni
accusative	gen.	Kosamoni	Kosamoni
genitive		Kosamoni	Kosamojeni Kosamoideni Kosamoitteni
partitive		Kosamoani	Kosamojani Kosamoitani
inessive		Kosamossani	Kosamoissani
elative		Kosamostani	Kosamoistani
illative		Kosamooni	Kosamoihini
adessive		Kosamollani	Kosamoillani
ablative		Kosamoltani	Kosamoiltani
allative		Kosamolleni	Kosamoilleni
essive		Kosamonani	Kosamoinani
translative		Kosamokseni	Kosamoikseni
abessive		Kosamottani	Kosamoittani
instructive		—	—
comitative		—	Kosamoineni

second-person singular possessor
		singular	plural
nominative		Kosamosi	Kosamosi
accusative	nom.	Kosamosi	Kosamosi
accusative	gen.	Kosamosi	Kosamosi
genitive		Kosamosi	Kosamojesi Kosamoidesi Kosamoittesi
partitive		Kosamoasi	Kosamojasi Kosamoitasi
inessive		Kosamossasi	Kosamoissasi
elative		Kosamostasi	Kosamoistasi
illative		Kosamoosi	Kosamoihisi
adessive		Kosamollasi	Kosamoillasi
ablative		Kosamoltasi	Kosamoiltasi
allative		Kosamollesi	Kosamoillesi
essive		Kosamonasi	Kosamoinasi
translative		Kosamoksesi	Kosamoiksesi
abessive		Kosamottasi	Kosamoittasi
instructive		—	—
comitative		—	Kosamoinesi

first-person plural possessor
		singular	plural
nominative		Kosamomme	Kosamomme
accusative	nom.	Kosamomme	Kosamomme
accusative	gen.	Kosamomme	Kosamomme
genitive		Kosamomme	Kosamojemme Kosamoidemme Kosamoittemme
partitive		Kosamoamme	Kosamojamme Kosamoitamme
inessive		Kosamossamme	Kosamoissamme
elative		Kosamostamme	Kosamoistamme
illative		Kosamoomme	Kosamoihimme
adessive		Kosamollamme	Kosamoillamme
ablative		Kosamoltamme	Kosamoiltamme
allative		Kosamollemme	Kosamoillemme
essive		Kosamonamme	Kosamoinamme
translative		Kosamoksemme	Kosamoiksemme
abessive		Kosamottamme	Kosamoittamme
instructive		—	—
comitative		—	Kosamoinemme

second-person plural possessor
		singular	plural
nominative		Kosamonne	Kosamonne
accusative	nom.	Kosamonne	Kosamonne
accusative	gen.	Kosamonne	Kosamonne
genitive		Kosamonne	Kosamojenne Kosamoidenne Kosamoittenne
partitive		Kosamoanne	Kosamojanne Kosamoitanne
inessive		Kosamossanne	Kosamoissanne
elative		Kosamostanne	Kosamoistanne
illative		Kosamoonne	Kosamoihinne
adessive		Kosamollanne	Kosamoillanne
ablative		Kosamoltanne	Kosamoiltanne
allative		Kosamollenne	Kosamoillenne
essive		Kosamonanne	Kosamoinanne
translative		Kosamoksenne	Kosamoiksenne
abessive		Kosamottanne	Kosamoittanne
instructive		—	—
comitative		—	Kosamoinenne

third-person possessor
		singular	plural
nominative		Kosamonsa	Kosamonsa
accusative	nom.	Kosamonsa	Kosamonsa
accusative	gen.	Kosamonsa	Kosamonsa
genitive		Kosamonsa	Kosamojensa Kosamoidensa Kosamoittensa
partitive		Kosamoaan Kosamoansa	Kosamojaan Kosamoitaan Kosamojansa Kosamoitansa
inessive		Kosamossaan Kosamossansa	Kosamoissaan Kosamoissansa
elative		Kosamostaan Kosamostansa	Kosamoistaan Kosamoistansa
illative		Kosamoonsa	Kosamoihinsa
adessive		Kosamollaan Kosamollansa	Kosamoillaan Kosamoillansa
ablative		Kosamoltaan Kosamoltansa	Kosamoiltaan Kosamoiltansa
allative		Kosamolleen Kosamollensa	Kosamoilleen Kosamoillensa
essive		Kosamonaan Kosamonansa	Kosamoinaan Kosamoinansa
translative		Kosamokseen Kosamoksensa	Kosamoikseen Kosamoiksensa
abessive		Kosamottaan Kosamottansa	Kosamoittaan Kosamoittansa
instructive		—	—
comitative		—	Kosamoineen Kosamoinensa

Kosamo is the 3188^th (tied with 10 other surnames) most common surname in Finland, belonging to 244 individuals, according to February 2023 data from the Digital and Population Data Services Agency of Finland.