Karnatakabhashabhushana 3.6

After [stems] denoting female or male persons, ir, ar, dir, and vir [occur] in some cases.

At the beginning of case inflections following words denoting female and male persons, these [elements]—ir, ar, dir, vir—are prescribed in some cases as exceptions to gaḷ.

peṇḍir,

toḻtir,

naṇṭar,

nallar,

magaḷdir,

tammandir,

tāyvir,

[and] tandivir.

[The marker] gaḷ also occurs in some cases:

ayyaṅgaḷ,

abbegaḷ.

In some cases both [occur]:

māvandir,

māvaṅgaḷ;

attevir,

attegaḷ.