Löve is not a German or Swiss German word, so the umlaut is simply gratuitious.
(Other languages such as Dutch or French use diacritics to mark a vowel as not-dipthongised, but that doesn't apply here either.)
(Other languages such as Dutch or French use diacritics to mark a vowel as not-dipthongised, but that doesn't apply here either.)
I'll try not to take that as an insult to speakers of Swedish, Finnish, Icelandic, Estonian, Hungarian, Turkish, and any of the other dozen languages which make use of the character.