1. As a surname: This is the most common usage. For example, "The famous singer, Natalie Singer, is known for her powerful voice."
2. As a brand name: Some companies use "Singer" as their brand name. For instance, "My grandmother still uses her old Singer sewing machine."
3. As a nickname: While less common, you might use "Singer" as a nickname for someone who is known for their singing ability. For example, "Everyone calls him The Singer, even though he's not a professional musician."
Important Note: When using "Singer" as a proper noun, it should always be capitalized.
Example:
"I went to see Singer, the band, in concert last night."
In this example, "Singer" is capitalized because it's the name of the band.