Q:

Using 滿喜由 as a male name in Mainland China

I am a foreigner with a difficult name. Could I use 滿喜由 as a full male name in Mainland China without causing too much hassle in communication?
How does 滿喜由 sound to native chinese speakers?

A:

I guess 喜由 is some kind of transcription of Dio in Dionisio. As pointed out by @TangHo, this transcription very unfortunately sounds like a sex drug.
The standard transcription of Greek (and derived Latin) Dio- is「狄奧」:

Dio of Alexandria: 亞歷山卓的狄奧
Cassius Dio: 卡西烏斯・狄奧

Dionysus has the alternative 狄俄倪索斯.
This transcription matches the Greek, Latin, and Spanish ways of pronouncing Dio-. The (alternative) English way of pronouncing Dio- sounds something like Dye-oh, which should be rendered as 戴歐.
In modern transcription practice,「狄」tends to be avoided in favour of「迪」, because「狄」is more commonly associated with barbarians occupying the northern borders in Ancient China. I would render your name as 迪奧 or 迪歐.

A:

How does 滿喜由 sound to native Chinese speakers?

滿喜由 sounds like 滿喜油. It would be a good name for 春藥 (aphrodisiac)
樂, 悅, 慶, 歡 can also mean 'joyful' . How about '滿慶歡' / '满庆欢' (full of joy and happiness). It incorporates the surname '滿'(full) with the first name 慶歡(joy and happiness) into a meaningful full name. And it sounds common enough to be a native Chinese name

