I imagine the pastor from Tjarstad who compiled the Household Clerical Survey became tired of writing Tjarstad over and over--so he abbreviated it with a "T."
And that's how it got put in the index.
And that's how it should be done.
Note: Samuel was searched for as an exercise simply for this blog post---and I discovered two entries for him in the Household Clerical Survey as a result.
Lesson number one: Avoid being overly specific in creating database searches. Sometimes too much information is too much.
Lesson number two: sometimes it pays to search for people you've already located. One never knows what might turn up.