diff --git c/src/wp-includes/formatting.php w/src/wp-includes/formatting.php
index bf03e78e1e..5840f8e58a 100644
--- c/src/wp-includes/formatting.php
+++ w/src/wp-includes/formatting.php
@@ -1792,6 +1792,8 @@ function remove_accents( $string ) {
 			'Ž' => 'Z',
 			'ž' => 'z',
 			'ſ' => 's',
+			'î'  => 'i',
+			'΅Ι' => 'i',
 			// Decompositions for Latin Extended-B
 			'Ș' => 'S',
 			'ș' => 's',