How to name invented languages with authenticity
Real languages have names reflecting geographic or cultural origin. Spanish comes from Hispania; French from the Franks; Quechua is a word the speakers use to designate themselves. When you christen your conlang, follow that pattern: the name should plant a clue about who speaks it, where it's spoken or what role it plays in the culture.
The working formula combines cultural root (Vael, Khar, Sel) with linguistic suffix (-an, -ic, -ish) and narrative descriptor (Old, Sacred, Northern). Old Northern Vaelian already carries information: there's a modern variant, there's a southern version, it's associated with an earlier historical moment. That structure mimics the realism of vulgar Latin, classical Greek, Mandarin Chinese.
For worlds with multiple cultures, define genealogical relationships. Old Vaelian is the proto-language from which Northern Vaelian (modern Elvish) and Vulgar Vaelian (simplified human) derive. That linguistic stratification gives historical depth without needing to invent complete grammar. Tolkien did this with Quenya (archaic high Elvish) and Sindarin (common derived Elvish).
Applications for fantasy, sci-fi and conlangs
In epic fantasy, languages mark cultural identity. Tolkien dedicated his entire life to developing Quenya, Sindarin, Khuzdul, Black Speech; each communicates something about its people. Dwarves speak something guttural and closed because they live underground; elves something melodic and open because they live among trees. Your naming should reflect that correspondence between phonetics and culture.
For sci-fi with alien cultures, names can break human conventions. Klingon, Vulcan, Na'vi are translated names for human audience; original speakers would call them otherwise. That duplicity enriches worldbuilding: the language we call Klingon is called tlhIngan Hol. That translation note plants authenticity.
For conlangs without associated universe (Esperanto, Lojban, Toki Pona), the name often has philosophical intention. Esperanto means "one who hopes"; Toki Pona is "simple language"; Lojban is "logical language". If your conlang has purpose (auxiliary, logical, artistic), the name should declare it. That ideological transparency attracts adoption from speakers interested in the philosophical project.
Common mistakes when naming invented languages
First mistake: derivative names without variation. Elvish, Dwarvish, Orcish are generic labels a thousand worlds already used. Better name specifically: Vaelian instead of Elvish, Khuzdul instead of Dwarvish. Speakers of a language rarely self-designate by race ("I speak Human" sounds odd); they use their own cultural name.
Second mistake: ignoring phonotactics. If your language is called Pkhrzthngi, it sounds unpronounceable and readers avoid it. Real language names usually have between 2 and 4 syllables with alternating consonant-vowel structure: Quechua, Swahili, Mandarin. If your name exceeds 5 syllables or stacks consonants, simplify it. Vaelian is better than Vaelirthandirian.
Third mistake: inconsistency between language name and language words. If your language is called Mellifluous but words are krpzthk and vrgzn, there's sonic disconnect. The language name should sample its own phonetics. Quenya uses typical Quenya sounds; your conlang should do the same. If most words have open vowels and soft consonants, the language name should reflect that.
Building linguistic tradition for your world
A language doesn't exist in vacuum: it lives in grammar, literature and rituals. For each relevant conlang, define: what word order predominates (SVO, SOV, VSO)? does it have grammatical cases or use prepositions? does it distinguish tense or aspect? Those decisions affect how your characters think in that language. Quenya speakers, agglutinative language with many cases, express long philosophical ideas in few compound words.
Preserved literature matters. What texts survive in your ancient language? Epic poems like Beowulf, religious treatises like the Vedas, administrative records like Sumerian tablets? That choice shapes which peoples preserve it: Elvish monasteries keep poetry; human secretaries preserve commercial receipts. Your characters research extinct languages by deciphering those texts.
Languages also mark social status. In your world, who learns which language? A noble of the northern kingdom might learn Old Vaelian as sign of education; a peasant speaks only Vulgar Vaelian. When your protagonist quotes verse in dead language, they demonstrate cultured class without you saying it explicitly. That linguistic stratification enriches dialogues and conflicts: two characters speaking the same language but with different registers convey immediate social tension.