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Analysis. amu- (that, yonder) + -tra (locative suffix denoting place). The form points to a distal demonstrative stem built from the remote-reference particle am-, cognate with Sanskrit amu-, Latin ambo (both, originally pointing away), meaning 'that yonder one'; -tra generalizes it to 'in that place'.
Etymology. From amu-, the distal demonstrative stem (Sanskrit amu-, 'that, yonder'), cognate with Latin ambo 'both' (originally 'the two [pointing away]'). The suffix -tra is an ancient locative-forming suffix (seen also in Sanskrit atra, tatra, yatra 'where, in which place'), from the same root as English there, German da, pointing to an old deictic *-tro. The word's distal force ('there, at that place') preserves the spatial deixis of the remote demonstrative.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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