I have the following information about this surname.Hope someone thinks it is useful.My source is reference books transcribed from church records found at the Easton Public Library in Northampton County, PA.Spellings are as I found them.
From the church record of the Evangelical Lutheran Congregation of the Stone Church near Kreidersville, Allen Township, Northampton County, PA:
Baptisms: pg 88: Susanne, d/o Jacob & Hanne Wildonner; b. Oct 3, 1814; bap. Feb 12, 1815; sponsors: Jonah & Katherine Arner
pg 94: Georg, s/o Georg & Magdalena Wildanner; b. Aug 15, 1817; bap. Nov 30, 1817; sponsors Joseph Hagenbach & Regina Nagel
pg 95: Maria Anna, d/o Jacob & Hanne Wildanner; b. Jun 2, 1818; bap. Oct 3, 1818; sponsors: John Kohler & Polly Hausknecht
pg 97: Katherine d/o George & Magdalena Wildanner; b. Jul 7, 1819; bap. Oct 3, 1819; sponsors: Johan Hauer and Elisabeth Faust
Confirmations: 1791: pg 122: Magdalene, age 15, d/o Ludwig Wildanger