The name Mantas observes its official name days in Lithuania on two dates: July 15 and October 1.
Mantas is a distinguished masculine name primarily rooted in Lithuania, where it holds high traditional popularity. It seldom appears in the USA but serves as a clear marker of Baltic heritage globally. The name is etymologically linked to concepts of intelligence, counsel, and deep thought, reflecting its cultural importance. Its overall tone is strong, classic, and intellectually inclined, projecting a vibe of thoughtful dependability. The usage of Mantas is strictly gendered worldwide, classifying it exclusively as a male given name.
| Country | Day | Month | Names |
 Lithuania | 4 | January | Arimantas, Arimante, Benedikta, Titas |
| Lithuania | 23 | January | Algimantasp, Gailgedas, Gunda, Raimundas |
| Lithuania | 25 | January | Jaunutis, Jomantas, Povilas, Viltenis, Ziede |
| Lithuania | 26 | January | Daugis, Eigile, Justas, Rimantas |
| Lithuania | 31 | January | Astra, Budvile, Marcele, Skirmantas |
| Lithuania | 4 | February | Andrius, Arvile, Gustas, Joana, Vydmantas |
| Lithuania | 8 | February | Daugvile, Dromantas, Honorata, Saliamonas |
| Lithuania | 24 | February | Gedmantas, Goda, Motiejus |
| Lithuania | 25 | February | Margiris, Rasa, Regimantas, Viktoras |
| Lithuania | 8 | March | Beata, Gaudvile, Laima, Vydmantas |
| Lithuania | 9 | March | Dominykas, Pranciska, Visgaile, Zygimantas |
| Lithuania | 14 | March | Darmantas, Karigaile, Matilda |
| Lithuania | 20 | March | Filomenas, Imgarda, Irma, Tautvile, Zygimantas |
| Lithuania | 24 | March | Daumantas, Donardas, Gabrielius, Ganvile, Liucija |
| Lithuania | 25 | March | Bermantas, Kantrimas, Normantas, Normante |
| Lithuania | 30 | March | Ferdinandas, Gvidonas, Meda, Rusne, Virmantas |
| Lithuania | 12 | April | Damijonas, Galmantas, Julius, Jurate |
| Lithuania | 25 | April | Grazvyda, Grazvyde, Morkus, Tolmantas, Zadmante |
| Lithuania | 29 | April | Augustinas, Indre, Rita, Tarmantas |
| Lithuania | 1 | May | Vydmante, Zigmantas, Zigmas, Zilvinas |
| Lithuania | 2 | May | Atanazas, Eidmantas, Meile |
| Lithuania | 16 | May | Bite, Ubaldas, Vaidmantas |
| Lithuania | 22 | May | Aldona, Eimantas, Elena, Julija, Rita |
| Lithuania | 24 | May | Gerardas, Gina, Vilmantas |
| Lithuania | 25 | May | Almantas, Danute, Urbonas |
| Lithuania | 26 | May | Algimantas, Eduardas, Milvyde, Vilhelmina |
| Lithuania | 11 | June | Aluona, Flora, Ramintas, Tvirmantas |
| Lithuania | 11 | July | Kipras, Kiprijonas, Pijus, Sarune, Vilmantas |
| Lithuania | 4 | August | Domantas, Gerimantas, Irta, Milgede |
| Lithuania | 10 | August | Aiste, Asterija, Astra, Laurynas, Norimantas |
| Lithuania | 23 | August | Girmantas, Pilypas, Tautgaile |
| Lithuania | 31 | August | Raimunda, Raimundas, Vilmantas, Vilmante |
| Lithuania | 13 | September | Barmantas, Barvyde, Mangailis |
| Lithuania | 15 | September | Eugenija, Nikodemas, Rimgaile, Vismantas |
| Lithuania | 30 | September | Bytaute, Jeronimas, Sofija, Zymantas |
| Lithuania | 6 | October | Brunonas, Budvydas, Eismantas, Vytene |
| Lithuania | 3 | November | Hubertas, Narvaine, Silvija, Vydmantas |
| Lithuania | 6 | November | Asmantas, Leonardas, Vygaude |
| Lithuania | 12 | November | Alvile, Asmantas, Kristinas, Renata |
| Lithuania | 14 | November | Emilis, Judita, Ramantas, Saulene |
| Lithuania | 21 | November | Alberta, Eibarte, Gomantas, Honorijus |
| Lithuania | 27 | November | Girvyde, Skomantas, Virgilijus |
| Lithuania | 6 | December | Bilmantas, Mikalojus, Norvyde |