onomastika

/onomastika/

Cases

FormWhen to use it
nominativeonomastikathe onomasticsthe plain dictionary form — the doer of the sentence
genitiveonomastikanıthe onomastics'the owner — whose it is
accusativeonomastikanıthe onomastics (as the object)a specific, known object — whom or what
dativeonomastikağato the onomasticsdirection or recipient — to where, to whom
locativeonomastikadaat / in the onomasticswhere it is; also having — mende bar, "I have it"
ablativeonomastikadanfrom the onomasticswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

Owned
myonomastikammy onomastics
youronomastikangyour onomastics
his / heronomastikasıhis / her onomastics
ouronomastikabızour onomastics
you all'sonomastikağızyou all's onomastics
theironomastikalarıtheir onomastics

There is no plural of this word. The ending would attach like any other — it is the word, not the grammar, that refuses: this is not something Karachay counts.