Sydney Costello
Last reviewed by a human: 2026-07-17
Last checked: August 17, 2026 · accounts live ✓
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Real. Sydney Costello is one of three Vancouver-raised sisters — alongside Georgia and Sabrina — behind swimwear brand Strawberry Milk Mob, where she goes by the fruit-themed persona "Coconut." She runs her own Shopify-powered brand, Coconut Milk Mob (a pajama and loungewear label at coconutmilkmob.com), whose own site navigation links directly to sister brand strawberrymilkmob.com — and Strawberry Milk Mob's official site links back to Coconut Milk Mob in its own footer navigation, a reciprocal first-party cross-confirmation between the two sisters' official domains. Her TikTok account, @coconutmilkmob, is a documented first-party platform account showing roughly 758,000 followers and 103.6 million cumulative likes as of mid-2026. Named-byline coverage independently confirms the same identity. A December 2024 profile on MUUZ, bylined Sophia Wheway, names "Sydney (Coconut)" directly and links to @coconutmilkmob, describing her as "the hype queen" known for "dishing out hilarious (and sometimes questionable) boy advice." A July 2024 piece on Informa TechTarget's marketing blog, bylined Sonya Matejko, likewise identifies Sydney Costello as Georgia's sister operating @coconutmilkmob and credits the trio's unscripted, personality-driven content for the brand's viral growth. Shopify's own company blog, profiling the brand's rise from a Vancouver basement to a dedicated 2024 headquarters, reports that "Georgia and Sydney drew up a pattern" for the brand's first bikini design together — placing Sydney at the founding of the business alongside Georgia in 2018, not just as a later addition. Search results for "Sydney Costello" also surface several unrelated people who share the name — including a hockey player, a college softball player, and other private individuals with no connection to Strawberry Milk Mob — so results can mix people together; this page is specifically about the Strawberry Milk Mob "Coconut." This page is unclaimed and compiled from public sources.
All of her, everywhere — every known account
- TikTok @coconutmilkmob Official Roughly 758K followers, 103.6M likes as of July 2026. Named-byline press (MUUZ, Informa TechTarget) directly identifies this as Sydney Costello's account, and its handle matches her own official domain, coconutmilkmob.com.
- Website coconutmilkmob.com Official Her own Shopify-powered pajama/loungewear brand; reciprocally cross-linked with sister brand strawberrymilkmob.com in both sites' navigation.
- Instagram @sydneycostello Unverified Name-matched personal account, but not cross-linked from either official domain, so we don't treat it as fully confirmed.
- Website (sister brand) strawberrymilkmob.com Official Georgia Costello's official Strawberry Milk Mob site; its navigation links directly to Sydney's own Coconut Milk Mob domain.
Quick answers
What is Sydney Costello's real name?
Sydney Costello is the name she uses herself — it's her own Instagram handle (@sydneycostello) and matches the name used consistently in named press coverage about her role at Strawberry Milk Mob. "Costello" is the family's already-public business surname, self-disclosed via sister Georgia's own official channels (her Forbes 30 Under 30 listing and Strawberry Milk Mob's official site).
Is every “Sydney Costello” online the same person?
No — the name gets tangled with others, and telling them apart is half the point of this page.
- Several unrelated people also named "Sydney Costello" appear in public records and social platforms, including a hockey player and a college softball player, with no connection to Strawberry Milk Mob.
Scam & impersonation warnings
- Multiple unrelated people also named "Sydney Costello" appear in search results, including a hockey player and a college softball player — search results can mix people together. This page is specifically about the Strawberry Milk Mob "Coconut."
- As with her sisters' brand accounts, similarly named or copy-cat TikTok/Instagram accounts may circulate. Only the accounts cross-confirmed above are treated as hers; treat others as unconfirmed.
The documented facts
- A named-byline profile on MUUZ (by Sophia Wheway, published Dec. 4, 2024) identifies her directly as "Sydney (Coconut)" and links to her TikTok account @coconutmilkmob, describing her as "the hype queen" who is known for "dishing out hilarious (and sometimes questionable) boy advice" Source: MUUZ — Strawberry Milk Mob: The Sisters Taking Over TikTok · documented
- A July 16, 2024 piece on Informa TechTarget's marketing blog (bylined Sonya Matejko) identifies Sydney Costello as sister to Georgia Costello and the operator of TikTok account @coconutmilkmob, crediting the three sisters' unscripted content style for the brand's viral growth Source: Informa TechTarget — 4 Breakout Success Brands (And Their Content Strategies) · documented
- Runs her own Shopify-powered brand, Coconut Milk Mob (coconutmilkmob.com), a pajama/loungewear label; the site's own navigation links directly to sister brand strawberrymilkmob.com, and Strawberry Milk Mob's own official site links back to Coconut Milk Mob in its footer navigation — a reciprocal first-party cross-confirmation between the two official domains Source: coconutmilkmob.com (her own official domain) · documented
- Shopify's own company blog, profiling Strawberry Milk Mob's growth, reports that "Georgia and Sydney drew up a pattern and headed to their childhood basement in Vancouver" to design the brand's first bikini — placing her at the brand's 2018 founding alongside Georgia Source: Shopify (Substack): "How Strawberry Milk Mob built a sisterhood of swimwear" · documented
- Her TikTok account, @coconutmilkmob, showed roughly 758,000 followers, 351 following, and 103.6 million cumulative likes when directly captured from the platform in July 2026 Source: TikTok — @coconutmilkmob · documented
- A personal Instagram account under the matching handle @sydneycostello (display name "SYDNEYCOSTELLO") is publicly listed, though we could not independently cross-confirm it as hers via a reciprocal link from either official domain Source: Instagram — @sydneycostello · reported
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