אָח

From LSJ

ἄφες ἡμῖν τὰ ὀφειλήματα ἡμῶνforgive us our trespasses

Source

English (Strong)

a primitive word; a brother (used in the widest sense of literal relationship and metaphorical affinity or resemblance (like אָב)): another, brother(-ly); kindred, like, other. Compare also the proper names beginning with "Ah-" or "Ahi-".
a variation for אֲהָהּ; Oh! (expressive of grief or surprise): ah, alas.
of uncertain derivation; a fire-pot or chafing dish: hearth.