I don't have a traditional middle name, but my mother's last name is part of my name. Using a pseudonym for illustration purposes, let's say my name is Steven Jones Smith. Jones in this case is not a middle name, but is frequently conflated with one.

On the Nexus application, there was a separate field for "maternal name". I put "Jones" in that field. However, other travel documents (e.g. passport) do not make this distinction; my passport simply lists "Smith" under last name and "Steven Jones" under given names. Correspondingly, the MR part has SMITH<<STEVEN<JONES.

And to complicate things, the travel system at work concatenates the two names, issuing tickets to "Mr Smith, Stevenjones". This has, somewhat to my surprise, never caused an issue at normal checkpoints. However, am I going to have a problem with Nexus?