Possibly ontto + -nen, through place names with ontto.
Onttonen
Inflection of Onttonen (Kotus type 38/nainen, no gradation) | |||
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nominative | Onttonen | Onttoset | |
genitive | Onttosen | Onttosten Onttosien | |
partitive | Onttosta | Onttosia | |
illative | Onttoseen | Onttosiin | |
singular | plural | ||
nominative | Onttonen | Onttoset | |
accusative | nom. | Onttonen | Onttoset |
gen. | Onttosen | ||
genitive | Onttosen | Onttosten Onttosien | |
partitive | Onttosta | Onttosia | |
inessive | Onttosessa | Onttosissa | |
elative | Onttosesta | Onttosista | |
illative | Onttoseen | Onttosiin | |
adessive | Onttosella | Onttosilla | |
ablative | Onttoselta | Onttosilta | |
allative | Onttoselle | Onttosille | |
essive | Onttosena | Onttosina | |
translative | Onttoseksi | Onttosiksi | |
abessive | Onttosetta | Onttositta | |
instructive | — | Onttosin | |
comitative | See the possessive forms below. |