Final answer:
The trendiness of names can be quantified by analyzing data on name popularity over time, such as birth certificates or census data. By comparing the frequency of different names in different years, trends can be identified and quantified.
Step-by-step explanation:
Quantifying the "trendiness" of names can be achieved by analyzing data on name popularity over time. This can be done by examining the frequency of names in official records, such as birth certificates or census data. By comparing the popularity of different names in different years, trends can be identified and quantified. For example, the Social Security Administration provides data on baby names in the United States, which can be used to determine the popularity of names over time.