A name that means sorrow or pain?

Female names:

The meaning of the name Barb is Stranger

The meaning of the name Polly is Great Sorrow

The meaning of the name Lola is Sorrows

The meaning of the name Dolores is Sorrows

The meaning of the name Tristessa is Sadness

The meaning of the name Jela is Father Suffered During Birth

The origin of the name Jela is Swahili

Notes: Swahili word for 'jail'

The meaning of the name Desdemona is Misery

Male names:

The meaning of the name Brennan is Tear, Sorrow

The meaning of the name Wallis is Foreigner, Stranger

The meaning of the name Thanos is Death

Not the prettiest names but they have the meaning you're looking for.

1 Autumn Paige.2 Caydence Raine.3 Fallon Journey.4 Charlotte Addison.5 Summer Bleu.6 Winter Mackenzie.7 Willow Charisma.8 Blakely Skye.9 Peyton Elena.10 Delilah Olivia.

For a male or female character?

Jabez (for a boy) is a biblical name meaning pain or sorrow.

Dolores (for a girl) is also biblical and means pain. It sounds a bit old-fashioned, but it has a lot of variations and abbreviations which you might like better: http://www.babynamespedia.com/meaning/Dolores

Monos is the Greek god of pain, but it doesn't make a particularly good name imo. You could always make up some kind of variation of it though. Wikipedia lists 'personified concepts' though, which are basically things that the Greeks thought should be represented by a mythological person. So these ones known as 'the Algea' (I think they are 3 sisters) might be helpful:

The Algea (Ἄλγεα), spirits of pain and suffering

Achos (Άχος) "trouble, distress"

Ania (Ανία) "ache, anguish"

Lupe (Λύπη) "pain, grief, sorrow"

A male name or a female name?

The Spanish girls' name 'Dolores' literally means 'pains'.

Pentheus means 'the sorrowful one'.

dolorous

It depends..