Rare name, Estonia 1700: Evastmah?

[Astrid K. Halleraker]

In Reval Saint Michaels congregation wich consisted of both Finnish and Swedish members in the first years,
a rare name occurs in the church book. It is spelled like this: Evastmah and possibly also Evostama.
Is this name known to anyone at this forum. If you have some knowledge, please provide
information. How could this particular name be translated to a danish, german or swedish name,
with the same meaning.

[Astrid K. Halleraker]

Please ignore the previous posting, it's not a name, after all.