A familiar name to many (3)

I believe the answer is:

tom

I'm a little stuck... Click here to teach me more about this clue!

'a familiar name' is the definition.
'Tom' can be an answer for 'name'. I am not sure about the 'a familiar' bit.

'to many' is the wordplay.
'many' becomes 'm' (Roman numeral for a thousand).
'to'+'m'='TOM'

Can you help me to learn more?

(Other definitions for tom that I've seen before include "He is associated with Dick and Harry" , "Male beast" , "Man's name; male cat" , "Boy running off with pig" , "Very small person" .)

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