Familiar name for a sheep (male) (7)

I believe the answer is:

bertram

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'male' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'familiar name for a sheep' is the wordplay.
'familiar name' becomes 'bert' (I am not sure about the 'familiar' bit.).
'for' says to put letters next to each other.
'a sheep' becomes 'ram' (male sheep).
'bert'+'ram'='BERTRAM'

Can you help me to learn more?

(Other definitions for bertram that I've seen before include "Wooster" , "Chap" .)

I've seen this clue in the Evening Standard.

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