I am become a name

According to Wikipedia...

Early Modern English used "to have" and "to be" as the auxiliaries for the present perfect, with a similar distinction to other modern European languages. This usage has practically disappeared from Modern English.

Examples of this conjugation can still be found in older texts:

Madam, the Lady Valeria is come to visit you.

-- The Tragedy of Coriolanus by William Shakespeare

Vext the dim sea: I am become a name;

-- Ulysses by Alfred, Lord Tennyson

Pillars are fallen at thy feet,
Fanes quiver in the air,
A prostrate city is thy seat,
And thou alone art there.

-- Marius amid the Ruins of Carthage by Lydia Maria Child

I am come in sorrow.

-- Lord Jim by Joseph Conrad