It is important to note that in many OE words containing vowels affected by umlaut , the /i/ or /j/ in the following unstressed syllable has been lost.
The mutations of a basic vowel by umlaut are of two kinds in OE.
Not all vowel gradations are caused by umlaut .
Come on folks, don't you know how to pronounce vowels with umlauts over them?
The evidence is that originally the German keyboard produced circumflexes instead of umlauts but it was replaced by an English keyboard.
There are actually 2 ways to make umlauted vowels.
How can I use umlauted letters in spelling surnames?
In the choral movement of his ninth symphony, the soprano soloist has to sing her highest note on the umlauted U in flügel, an even more daunting vowel sound than that in ‘who'd.’
Furthermore, Hungarian, Turkish and Finnish (which are Ural-Altaic languages like Korean and share phonetic qualities with it) also extensively use umlauts .
That's like the umlauted vowel in the first syllable of the German town name Tübingen.