Dean comes from an English surname, either a locational name meaning “valley” via Old English dene (valley), or an occupational name for someone who worked for a dean, the head of an ecclesiastical head of a cathedral. It comes from Latin decānus (chief of ten people) via decem (ten), which ultimately derives from a PIE root word.
A dean is also the head of a college or university, or someone in charge of a department or faculty.
Dean could also be used as a variant spelling of Deen or Dīn (دين), an Arabic male name meaning “religion, faith, creed” and “way of life” as well as having roots in Hebrew dinדִּין meaning “law, judgment”, which seems to be derived from a Proto-Semitic origin.
Origin: Proto-Indo-European; Proto-Semitic
Meaning: an English surname “valley” or “chief of ten”; from Arabic “religion, faith, creed” or “way of life”; also from Hebrew “law, judgment”
Douglas is the anglicized form of Scottish surname Dubhghlas meaning “dark river” or “dark stream”, composed of Scottish Gaelic dubh (black) and glais (water; green). It comes from the name of a river in Scotland from which the name of the clan Douglas derives its name from.
Interestingly, Douglas was originally used as a unisex name in the early 17th and 18th century but eventually it only became used as a male name.
Diego is a Spanish male name of uncertain etymology. It’s often been linked as a shortened form of Santiago, which itself is an abbreviated form of Latin Sanctus Iacobus “Saint James”, in reference to Saint James the great, the brother of John the Apostle, and also one of the Twelve Apostles of Jesus according to the New Testament.
James is the English form of Latin Iacobus< Ancient Greek Iakobos which comes from the Hebrew name Ya’aqov (Jacob) which comes from a Hebrew root word aqebעָקֵב “heel (of the foot) or essentially “supplanter”, referring to the Biblical Jacob, the younger twin brother of Esau who often “supplanted” his older brother.
During medieval times, Diego was Latinized as Didacus, a name of unknown origin though it’s been linked to Ancient Greek didakhe δῐδᾰχή (teaching, instruction), though whether Diego’s true origins lie there is unknown.
Diego is also a Spanish surname originating from the given name
Meaning: though the origin of the name is uncertain it may have originated as a shortened form of Santiago “Saint James”, or perhaps related to Latin Didacus “teaching”
Daniel is the name of several figures in the Bible, including the prophet Daniel, who features in the Book of Daniel in the Old Testament. It comes from a Hebrew name meaning “God is my judge” or “judge of God”, made up of Hebrew danדָּן (to judge) and elאֵל (god).
Daniel is also a surname originating from the given name.