You can't. German umlaut sounds don't exist in Hebrew. You would have to find a close vowel sound. For example, Guenther would be written גינטר (pronounced Geenter)
If you're just trying to find symbols with the shape of an umlaut in Hebrew, there isn't one. The closest you'll find is the vowel point "tsere" which appears under the letter like this (אֵ) and has the sound of "eh" as in bed.
You'd need a keyboard with umlauts, or you have to use unicode characters.
How do you write "Oases" in Hebrew
There is no Hebrew name for Tillie. Tillie is a German nickname for Matilda, which means "strength in battle". But you can write Tillie using Hebrew letters, and it would look like this: טילי
There is no such thing as Hindi Hebrew. But if you are asking how to write it in regular Hebrew, it's רובין
Possession in Hebrew is רכוש.
If you mean the spanish spelleing of haha (indicating laughter), in Hebrew you would write חחח if you mean the German expression meaning yes yes, in Hebrew that would be ken ken (כן כן) otherwise, Ja ja is not a real word.
There is no Hebrew equivalent for Terry, but you can write it in Hebrew letters as טרי
There is no Hebrew equivalent for Lorraine, but you can write it out in Hebrew letters as לוריין
There is no language called Israeli. People speak Hebrew and they write using Hebrew alphabets.
In Hebrew it is spelled like this: סידור
Lauren in Hebrew: לורן
"Prophets" is written in Hebrew as "נביאים".