[alexeisadeski3]

The agent found it odd that someone with a Jewish name would visit those countries. Customs, practices, etc are utterly irrelevant.

[rbehrends]

Lohman/Lohmann was originally a German name [1] (and Lohmann is still very common in Germany).

[1] "Loh"/"Lohe" is an old German word for wood/forest. See also the many German place names containing "loh(e)", such as Gütersloh or Dortmund-Loh.

[alexeisadeski3]

Most contemporary Ashkenazi Jewish names are German in origin.