The difference between Moniker and To-name

When used as nouns, moniker means a personal name or nickname, whereas to-name means a name added to another name.

check bellow for the other definitions of Moniker and To-name

Moniker as a noun:

A personal name or nickname; an informal label, often drawing attention to a particular attribute.

Examples:

"The rookie was upset at being called Lemon Drop until she realized that everyone on the team had a silly moniker."
Moniker as a noun:

A signature.
Moniker as a noun (computing):

An object (structured item of data) used to associate the name of an object with its location.

To-name as a noun:

A name added to another name; surname.
To-name as a noun:

A name in addition to the Christian name and surname of an individual, to distinguish him or her from others of the same name and usually indicating descent, place of residence, or some personal quality or attribute. Such to-names are often employed where the same families continually intermarry, and where consequently the same name is common to many individuals.