Okay, everyone, here is another challenge

My favorite male German name (and one I'm using in my story) is Dietrich. (It's pronounced like dee-trik, not dee-trish as I've heard some say). How would
þeudo rīks / thuida reiks / Theodoric / Dietrich have been spelled in Elder Futhark?
Also, Dietrich / Theodoric / Thiuda Reiks is said to be a Gothic name.
Only Gothic? My sources say the name roots come from Proto-Germanic, which is much broader than just Gothic. Any thoughts? Thanks for any help!
Germania_Echoes