In the Christmas song Jingle Bells what is the horses name?

Bobtail. this could also be a type of carriage or sleigh.

Bob tail refers to the way the horse's tail has been fixed, trimmed up, or tied up with ribbons. The Words of the song Jingle Bells are as follows:

Dashing through the snow

In a one horse open sleigh

O'er the fields we go

Laughing all the way

Bells on bob tails ring

Making spirits bright

What fun it is to laugh and sing

A sleighing song tonight

Oh, jingle bells, jingle bells

Jingle all the way

Oh, what fun it is to ride

In a one horse open sleigh

Jingle bells, jingle bells

Jingle all the way

Oh, what fun it is to ride

In a one horse open sleigh

A day or two ago

I thought I'd take a ride

And soon Miss Fanny Bright

Was seated by my side

The horse was lean and lank

Misfortune seemed his lot

We got into a drifted bank

And then we got upsot

Oh, jingle bells, jingle bells

Jingle all the way

Oh, what fun it is to ride

In a one horse open sleigh

Jingle bells, jingle bells

Jingle all the way

Oh, what fun it is to ride

In a one horse open sleigh yeah