Name

A surname is a name added on to the given name of individuals, often to indicate a family or clan relationship.

Vulcan family names are nearly unpronounceable by Humans. (TOS: "Journey to Babel")

The unpronounceable Vulcan name was described as a "first name" in TOS: "This Side of Paradise". No Vulcan family name has been given in canon.

Kzinti surnames were titles added to their names over their careers. (TAS: "The Slaver Weapon")

Most Klingons were addressed by their given names, and their full names had a patronymical surname, such as "son of Mogh" or "daughter of W'mar". (TNG: "Sins of the Father"; DS9: "Sons and Daughters")

The Trill are born with family last names. Once joined, they adapt their symbiont's name as their surname. (TNG: "The Host")

Many Bajorans, who have their family names as first names, have "distorted" their names in order to more easily acclimate to Starfleet and Federation norms. (TNG: "Ensign Ro")

Members of Vilix'pran's species are addressed by the second part of their name. For example, Vilix'pran is addressed as "Pran." (DS9: "Business as Usual")

It is possible that this second part of their name is a family name.

The Miradorn, seem to have a surname as a hyphenated part of their own name. Evidence of this is Ah-Kel and Ro-Kel. (DS9: "Vortex")

Charles Tucker referred to Feezal as "Mrs. Phlox," likely confusing Human custom with Denobulan customs. (ENT: "Stigma")

The Ferengi do not appear to use surnames, although they have occasionally been heard to use "son of..." or "daughter of..." in a similar fashion to the Klingons.

Last names

Societies with last name surnames include:

• Atreans (TNG: "Inheritance")
• Baneans (VOY: "Ex Post Facto")
• Betazoids (TNG: "Tin Man")
• Capellans (TOS: "Friday's Child")

Leonard James Akaar, son of Akaar, may in fact be a special case, as no other Capellans seemed to have surnames.

• Cardassians (DS9: "Second Skin")
• Humans (TOS: "The Cage")
• Klaestron (DS9: "Dax")
• 892-IV natives (TOS: "Bread and Circuses")
• Tanugans (TNG: "A Matter of Perspective")
• Trill (DS9: "Equilibrium" see below)
• Voth (VOY: "Distant Origin")

Societies where individuals were addressed by their second name include:

These may or may not indicate a family name.

• Andorians (DS9: "Prophet Motive")
• Angosians (TNG: "The Hunted")
• Argrathi (DS9: "Hard Time")
• Arkonians (ENT: "Dawn")
• Bolians (TNG: "Allegiance")
• Catullans (TOS: "The Way to Eden")
• Delb II natives (TNG: "The Drumhead")
• El-Aurians (DS9: "Rivals")
• Enarans (VOY: "Remember")
• Ennis (DS9: "Battle Lines")
• Enolians (ENT: "Canamar")
• Farians (DS9: "Prodigal Daughter")
• Ferengi (TNG: "The Perfect Mate")
• Haakonians (VOY: "Jetrel")
• Haliians (TNG: "Aquiel")
• Haven natives (TNG: "Haven")
• Idanians (DS9: "A Simple Investigation")
• Iotians (TOS: "A Piece of the Action")
• Kelemane's species (VOY: "Blink of an Eye")
• Klingons (VOY: "Year of Hell" see below)
• Kobliad (DS9: "The Passenger")
• Ktarians (TNG: "The Game")
• Lumerians (TNG: "Man of the People")
• Malcorians (TNG: "First Contact")
• Makull's species (VOY: "Time and Again")
• Markalians (DS9: "Hippocratic Oath")
• Melthusians (TNG: "Night Terrors")
• Meridians (DS9: "Meridian")
• Mizarians (TNG: "Allegiance")
• Pandronians (TAS: "Bem")
• Peliar Zel natives (TNG: "The Host")
• Promellians (TNG: "Booby Trap")
• Reegrunions (DS9: "Sanctuary")
• Romulans (Star Trek V: The Final Frontier)
• Rutians (TNG: "The High Ground")
• Sarpeidon natives (TOS: "All Our Yesterdays")
• Sikarians (VOY: "Prime Factors")
• Tagrans (TNG: "True Q")
• Takret (ENT: "The Catwalk")
• Tygarians (DS9: "The Homecoming")
• V'radians (ENT: "Rajiin")
• Varro (VOY: "The Disease")
• Ventaxians (TNG: "Devil's Due")
• Vhnori (VOY: "Emanations")
• Vidiians (VOY: "Lifesigns")
• Xepolites (DS9: "The Maquis, Part II")
• Xindi-Aquatics (ENT: "The Council")
• Xindi-Arboreals (ENT: "The Shipment")
• Yridians (TNG: "Birthright, Part I")
• Zakdorn (TNG: "Peak Performance")
• Zibalians (TNG: "The Most Toys")

First names

Societies with first name surnames include:

• Bajorans (TNG: "Ensign Ro")
• Humans (TOS: "Space Seed")
• Retellians (ENT: "Precious Cargo")
• Vulcans (TOS: "This Side of Paradise")