CilmeLearned borrowing from Latin pēnis.
Formaspenis(nominative, singular) · peņi(nominative, plural) · peņa(genitive, singular) · peņu(genitive, plural) · penim(dative, singular) · peņiem(dative, plural) · peni(accusative, singular) · peņus(accusative, plural) · peni(instrumental, singular) · peņiem(instrumental, plural) · penī(locative, singular) · peņos(locative, plural) · peni(singular, vocative) · peņi(plural, vocative)