The origins of Habsburg Castle's name are uncertain. There is disagreement on whether the name is derived from the High German Habichtsburg (hawk castle), or from the Middle High German word hab/hap meaning ford, as there is a river with a ford nearby. The first documented use of the name by the dynasty itself has been traced to the year 1108.

The Habsburg name was not continuously used by the family members, since they often emphasized their more prestigious princely titles. The dynasty was thus long known as the "House of Austria". Complementary, in some circumstances the family members were identified by their place of birth. Charles V was known in his youth after his birthplace as Charles of Ghent. When he became king of Spain he was known as Charles of Spain, and after he was elected emperor, as Charles V (in French, Charles Quint).

In Spain, the dynasty was known as the Casa de Austria, including illegitimate sons such as John of Austria and John Joseph of Austria. The arms displayed in their simplest form were those of Austria, which the Habsburgs had made their own, at times impaled with the arms of the Duchy of Burgundy (ancient).

After Maria Theresa married Duke Francis Stephen of Lorraine, the idea of "Habsburg" as associated with ancestral Austrian rulership was used to show that the old dynasty continued as did all its inherited rights. Some younger sons who had no prospects of the throne were given the personal title of "count of Habsburg".

The surname of more recent members of the family such as Otto von Habsburg and Karl von Habsburg is taken to be "von Habsburg" or more completely "von Habsburg-Lothringen". Princes and members of the house use the tripartite arms adopted in the 18th century by Francis Stephen.

The name of the dynasty is sometimes spelled in English publications as Hapsburg.

The progenitor of the House of Habsburg may have been Guntram the Rich, a count in the Breisgau who lived in the 10th century, and forthwith farther back as the medieval Adalrich, Duke of Alsace, from the Etichonids from which Habsburg derives. His grandson Radbot of Klettgau founded the Habsburg Castle. That castle was the family seat during most of the 11th, 12th and 13th centuries. Giovanni Thomas Marnavich in his book "Regiae Sanctitatis Illyricanae Faecunditas" dedicated to Ferdinand III, wrote that the House of Habsburg is descended from the Roman emperor Constantine the Great, an invention common in ruling dynasties at the time.

In the 12th century, the Habsburgs became increasingly associated with the Staufer emperors, participating in the imperial court and the emperor's military expeditions; Werner II, Count of Habsburg died fighting for Emperor Frederick I Barbarossa in Italy. This association helped them to inherit many domains as the Staufers caused the extinction of many dynasties, some of which the Habsburgs were heirs to. In 1198, Rudolf II, Count of Habsburg fully dedicated the dynasty to the Staufer cause by joining the Ghibellines and funded the Staufer emperor Frederick II's war for the throne in 1211. The emperor was made godfather to his newly born grandson, the future King Rudolf.

The Habsburgs expanded their influence through arranged marriages and by gaining political privileges, especially countship rights in Zürichgau, Aargau and Thurgau. In the 13th century, the house aimed its marriage policy at families in Upper Alsace and Swabia. They were also able to gain high positions in the church hierarchy for their members. Territorially, they often profited from the extinction of other noble families such as the House of Kyburg.
By the second half of the 13th century, Count Rudolph I (1218–1291) had become an influential territorial lord in the area between the Vosges Mountains and Lake Constance. On 1 October 1273, he was elected as a compromise candidate as King of the Romans and received the name Rudolph I of Germany. He then led a coalition against King Ottokar II of Bohemia who had taken advantage of the Great Interregnum in order to expand southwards, taking over the respective inheritances of the Babenberg (Austria, Styria, Savinja) and of the Spanheim (Carinthia and Carniola). In 1278, Rudolph and his allies defeated and killed Ottokar at the Battle of Marchfeld, and the lands he had acquired reverted to the German crown. With the Georgenberg Pact of 1286, Rudolph secured for his family the duchies of Austria and Styria. The southern portions of Ottokar's former realm, Carinthia, Carniola, and Savinja, went to Rudolph's allies from the House of Gorizia.

Following Rudolph's death in 1291,

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As they accumulated crowns and titles, the Habsburgs developed a family tradition of multilingualism that evolved over the centuries. The Holy Roman Empire had been multilingual from the start, even though most of its emperors were native German speakers. The language issue within the Empire became gradually more salient as the non-religious use of Latin declined and that of national languages gained prominence during the High Middle Ages.

Emperor Charles IV of Luxembourg was known to be fluent in Czech, French, German, Italian and Latin. The last section of his Golden Bull of 1356 specifies that the Empire's secular prince-electors "should be instructed in the varieties of the different dialects and languages" and that "since they are expected in all likelihood to have naturally acquired the German language, and to have been taught it from their infancy, [they] shall be instructed in the grammar of the Italian and Slavic tongues, beginning with the seventh year of their age so that, before the fourteenth year of their age, they may be learned in the same". In the early 15th century, Strasbourg-based chronicler Jakob Twinger von Königshofen asserted that Charlemagne had mastered six languages, even though he had a preference for German.

In the early years of the family's ascendancy, neither Rudolf I nor Albert I appears to have spoken French. By contrast, Charles V of Habsburg is well known as having been fluent in several languages. He was a native speaker of French and also knew Dutch from his youth in Flanders. He later added some Castilian Spanish, which he was required to learn by the Castilian Cortes Generales. He could also speak some Basque, acquired by the influence of the Basque secretaries serving in the royal court. He gained a decent command of German following the Imperial election of 1519. A witticism sometimes attributed to Charles was: "I speak Spanish/Latin [depending on the source] to God, Italian to women, French to men and German to my horse."

Latin was the administrative language of the Empire until the aggressive promotion of German by Joseph II in the late 18th century, which was partly reversed by his successors. From the 16th century most if not all Habsburgs spoke French as well as German and many also spoke Italian. Ferdinand I, Maximilian II and Rudolf II addressed the Bohemian Diet in Czech, even though it is not clear that they were fluent. By contrast there is little evidence that later Habsburgs in the 17th and 18th centuries spoke Czech, with the probable exception of Ferdinand III, who had several stays in Bohemia and appears to have spoken Czech while there. In the 19th century Francis I had some Czech and Ferdinand I spoke it decently.

Franz Joseph received …

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