Не доверяю Википедии, но за неимением иных источников, обращаюсь...
(там, правда, есть ссылки на источники):
https://en.wikipedia.org/wiki/Ralph_(name)
Хмм... Почему-то ссылка открывается неполно
Вот:
Ralph (pronounced ralf /rælf/; or, more traditionally, rayf /reɪf/[1]) is an English, Irish, Scottish, Dutch, Scandinavian and German male given name, derived from Old Norse Raðulfr (rað "counsel" + ulfr "wolf") through Old English Rædwulf and the longer form Radulf.[2]
The most common forms are:
Ralph, the common variant form in the English language, traditionally pronounced /reɪf/ but now commonly /rælf/, as spelled
Other forms of the name are:
Rafe, variant form which is a relatively rare male first name; it is pronounced /reɪf/, the same as the traditional but infrequent English pronunciation of Ralph.
Raef, variant form which is a very rare male first name (e.g. Raef Bjayou).
Raff, variant form which is a very rare male first name.
Raif, variant form which is a very rare male first name.[3]
Ralf, the traditional variant form in the Dutch, German and Swedish languages (although Ralph is also used as a given name in German and Swedish).
Raoul, the traditional variant form in the French language.
Raúl, the traditional variant form in the Spanish language.
Raul, the traditional variant form in the Portuguese and Italian languages.
Raül, the traditional variant form in the Catalan language.
Rádhulbh, the traditional variant form in the Irish language.