Where does “Δοσίθεος” come from?

Δοσίθεος (Ancient Greek) comes from Ancient Greek δόσις, from Ancient Greek δίδωμι, from Proto-Indo-European dédeh₃ti, from Proto-Indo-European deh₃- — to give.

Ancestry of “Δοσίθεος”, step by step

Δοσίθεος traces back through two separate lines of ancestry.

via Ancient Greek δόσις

Step	Language	Word	Meaning
1	Ancient Greek	δόσις	giving, a gift; license, permission; portion
2	Ancient Greek	δίδωμι	I give, present, offer; I grant, allow, permit;...
3	Proto-Indo-European	dédeh₃ti	to be giving
4	Proto-Indo-European	deh₃-	to give

via Ancient Greek Θεός

Step	Language	Word	Meaning
1	Ancient Greek	Θεός	God
2	Proto-Hellenic	tʰehós	god, deity
3	Proto-Indo-European	dʰéh₁s	god, godhead, deity; sacred place
4	Proto-Indo-European	dʰeh₁-	to do, put, place

Every word from Proto-Indo-European deh₃- →Every word from Proto-Indo-European dédeh₃ti →Every word from Ancient Greek δίδωμι →