The "No name", "NULL" and "NaN" values can appear in reports if an empty property string is sent, an empty numeric property value is sent, or a property isn't set in an event.
Insights reports will return a 'NULL' value when a property is not set in an event or when an empty string is sent.
Segmentation reports will return an "undefined" value when a property is not set, and a "NULL" value when an empty string is returned.
Funnel reports will return a "NaN" (Not a Number) value when a null numerical property is returned when segmenting a Funnel.
Remove (NULL) or NaN from reports
(NULL)/NaN values can be removed from reporting by typecasting the property to a boolean, and setting it equal to True.
Related Topic: What does an undefined property mean?