This is the 564th most frequent Finnish word.
vilppaan
"Vilppaan" is the genitive or accusative singular form of "vilpas," meaning "cool" or "refreshing" in English.
Here, "Vilppaan" is a possessive form (genitive case) indicating something belonging to Vilpas.
Vilppaan lämmin sävy houkutteli minua ostamaan sen.
The warm tone of Vilpas tempted me to buy it.
This usage shows "Vilppaan" as referring to Vilpas in a context of ownership and location.
Vilu karkottui Vilppaan tulisijan lämmössä.
The chill was warded off by the warmth of Vilpas's fireplace.
Here, 'Vilppaan' indicates possession, as it's derived from the name 'Vilppaa'.