Names: transcribe into katakana or replace with a different set?

Tunnel to X = XのトンネルかXへトンネル？
Merle = マールかメール？
Zeke = ジークかゼーク？
Shopping District = ?
Wizard City = ?
school = ?
Lumbering Troll = ?

MooShu = ??
Hingen = ?
...