"Rich Milky" wouldn't be OK, in my opinion - it doesn't sound like a natural way to name a cow in English. I think your idea borrowed from another story (Milky White) might be good for a
name. Buttercup suggests the richness of butter.

http://www.expage.com/namesofthecows

I am not a native speaker, but I suggest " rich-milk" or "creamy-milk", which are adjectives used as nouns. Furthermore, since the name is to be used in a children book, I believe, it is better that the name be explicitly denotative of "cow's rich milk/cow giving rich milk".

How about just "Milky".... "Milky the Cow"... Just a suggestion :)

How about just "Milky".... "Milky the Cow"... Just a suggestion :)

I could use a little more explanation to give a more definitive answer. Is this a talking cow? Character traits (i.e., friendly, happy, wistful, etc...). Creamy seems to work for me here given the lack of context. Miss Creamy? Interestingly enough, there is a stuffed toy with that name. Disturbing to look at, but nevertheless....

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Note added at 1 hr 58 mins (2005-03-19 19:53:24 GMT)
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Miss Creamyrich
Miss Creamymilk
Miss Milkbutter
One of the beauties of English in my opinion is its inherent flexibility.

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Note added at 2 hrs 0 min (2005-03-19 19:54:56 GMT)
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Like I said, Buttercup is a swell name for a cow but making the leap from buttercup to thinking of rich, creamy milk is a stretch.

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Note added at 2 hrs 5 mins (2005-03-19 20:00:01 GMT)
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Asker: What about Creamy Rich - as if a name and a surname? The sourse Russian name consists of 3 words.

Oh, I don\'t think you can do that. I\'d recommend finding a suitable surname. Mary Ellen Creamymilk. ×òî-òî â ýòîì ðîäå.

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Note added at 2 hrs 21 mins (2005-03-19 20:16:09 GMT)
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Asker: What about Creamy Rich - as if a name and a surname? The sourse Russian name consists of 3 words.

Oh, I don\'t think you can do that. I\'d recommend finding a suitable surname. Mary Ellen Creamymilk. ×òî-òî â ýòîì ðîäå.

Creampuff is "A shell of light pastry filled with whipped cream, custard, or ice cream." (Dictionary.com). BUT according to the dictionary it can also mean:
(Slang.) A weakling.
(Slang.) An old, especially secondhand car in very good condition

That may put you off using that word, but I still think it sounds like a nice name for a cow... I made a search for "named creampuff/ cream puff" on Google, and got a few search results, people calling their dogs, birds and cats "creampuff", and even this cow:
http://www.teddybeargifts.biz/index.asp?PageAction=VIEWPROD&... !

Other suggestions: "Milky way" and "Milkshake"

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Note added at 3 hrs 11 mins (2005-03-19 21:05:52 GMT)
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How about \"Cremosa\"?
True, it\'s not an English name, but it\'s the Italian/Spanish/Portuguese word for \"Creamy\", and I think it\'s widely understood (one Chupa Chups lollipop flavour is called \"Cremosa\"), and it sounds better than Creamy as a female name.

Another common cow name: Bessie.

Buttery is a synonym for rich, creamy...

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Note added at 3 hrs 43 mins (2005-03-19 21:38:09 GMT)
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Or... Bessie Buttermilk??

How about just Milkrich/Milk-Rich?
As in "rich in milk" - seeing you say that it's important to let the reader know that the cow gives rich milk. Also it sort of sounds like a name, methinks.
:-)
HTH