irk

/irk/

Cases

SingularPluralWhen to use it
nominativeirkthe wetherirklethe wethersthe plain dictionary form — the doer of the sentence
genitiveirknithe wether'sirklenithe wethers'the owner — whose it is
accusativeirknithe wether (as the object)irklenithe wethers (as the object)a specific, known object — whom or what
dativeirkgeto the wetherirklegeto the wethersdirection or recipient — to where, to whom
locativeirkdeat / in the wetherirkledeat / in the wetherswhere it is; also having — mende bar, "I have it"
ablativeirkdenfrom the wetherirkledenfrom the wetherswhere 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

One ownedSeveral owned
myirkimmy wetherirklerimmy wethers
yourirkingyour wetherirkleringyour wethers
his / herirkihis / her wetherirklerihis / her wethers
ourirkibizour wetherirkleribizour wethers
you all'sirkigizyou all's wetherirklerigizyou all's wethers
theirirkleritheir wetherirkleritheir wethers

The overlap in the last rows is real, not a mistake: irkleri can mean "his / her wethers", "their wether", or "their wethers" — context decides.