The first word of the Bible is בראשית. This word is made up of two morphemes, ב meaning ‘in’ and ראשית meaning ‘beginning’.
Taking a closer look at the word for ‘beginning’ we see that it has the same root (basic consonants) as the word for head, ראש.
This is a natural use in many ways: a person is usually born head first and we tend to say “form top to toe”, not vice versa.
Col. 1:15-18 about Jesus:
15 He is the image of the invisible God, the firstborn of all creation. 16For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through him and for him. 17And he is before all things, and in him all things hold together. 18And he is the head of the body, the church. He is the beginning, the firstborn from the dead, that in everything he might be preeminent. 19For in him all the fullness of God was pleased to dwell, 20and through him to reconcile to himself all things, whether on earth or in heaven, making peace by the blood of his cross.
So, Jesus is both ‘head’ and ‘beginning’. These words are not similar in Greek, but Paul doubtlessly knew how the two go together in Hebrew.
The same thought of ‘firstborn’ and ‘head’ is elaborated in Eph 1:20-23:
20that he worked in Christ when he raised him from the dead and seated him at his right hand in the heavenly places, 21 far above all rule and authority and power and dominion, and above every name that is named, not only in this age but also in the one to come. 22And he put all things under his feet and gave him as head over all things to the church, 23 which is his body, the fullness of him who fills all in all.
And let’s not forget Revelation 22.13:
I am the Alpha and the Omega, the first and the last, the beginning and the end.
It starts and it ends with Jesus.