admiration (n.)youdaoicibaDictYouDict
early 15c., "wonder," from Middle French admiration (14c.) or directly from Latin admirationem (nominative admiratio) "a wondering at, admiration," noun of state from past participle stem of admirari "admire," from ad- "at" (see ad-) + mirari "to wonder," from mirus "wonderful" (see miracle). The sense has weakened steadily since 16c.
wonder (v.)youdaoicibaDictYouDict
Old English wundrian "be astonished," also "admire; make wonderful, magnify," from the source of wonder (n.). Cognate with Dutch wonderen, Old High German wuntaron, German wundern. Sense of "entertain some doubt or curiosity" is late 13c. Related: Wondered; wondering.

Reflexive use (It wonders me that "I wonder why ...") was common in Middle English and as late as Tindale (1533), and is said to survive in Yorkshire/Lincolnshire. In Pennsylvania German areas it is idiomatic from German das wundert mich.