The Geographical Dictionary of Ancient and Mediaeval India c3.s1.6

c3.s1.6

(6) Non-initial m, as Ârâmanagara, Ârâ; Kumârî, Kuârî.
(7) Compound r,² including ṛ, as the affix Grâma, Gâma; Gayâśirsha, Gayâsisa Varendra, Barenda; Lodhravana (Kânana), Lodhmuna; Trikaliṅga, Tiliṅga Pṛthûdaka, Pihoâ, Pehoâ.
(8) l, as Mudgala-giri, Mudga-giri; Chaṭṭala, Chaṭṭa-grâma; Kolâhala, Kalhuâ.
(9) The sibilants ś, sh, s, especially when compounded with another consonant, as Śâlwapura, Âlwar; Śûkarakshetra, Ukhalakshetra; Peshṭhapura, Piṭhâpur; Kâshṭhamaṇḍapa, Kâṭmaṇḍu; Pushkara, Pokhrâ; Mânasa-sarovara, Mânsaro-vara; the affixes Sṭhâna, Sthala, Sthâna becoming Thâna, Thala, Thâna, respectively; Skhalatika-parvata, Khalatika-parvat; the affix Râshṭra, Râṭ; Hastisomâ, Hâtsu; Pâraskara, Thala Pârakara. In some cases of elision of the compound sibilants the preceding vowel is lengthened.
(10) h, as Varâha-kshetra, Bâramula; Hushkapura, Uskur; Hastakavapra, Astaka-vapra; Hṛishîkeśa, Rishikes; Hûṇadeśa, Undes; Praṇahîtâ, Praṇitâ.